diff --git a/resources/profiles/PrusaResearch.ini b/resources/profiles/PrusaResearch.ini
index 27d80b5337..12f16679b2 100644
--- a/resources/profiles/PrusaResearch.ini
+++ b/resources/profiles/PrusaResearch.ini
@@ -4752,7 +4752,7 @@ exposure_time = 10
 initial_exposure_time = 20
 material_type = Tough
 material_vendor = Harz Labs
-material_colour = #007EFD
+material_colour = #595959
 
 [sla_material:Harz Labs Dental Cast Red @0.025]
 inherits = *common 0.025*
@@ -4768,7 +4768,7 @@ exposure_time = 6
 initial_exposure_time = 30
 material_type = Tough
 material_vendor = Esun
-material_colour = #007EFD
+material_colour = #595959
 
 [sla_material:Photocentric Ash Grey @0.025]
 inherits = *common 0.025*
@@ -4800,7 +4800,7 @@ exposure_time = 4
 initial_exposure_time = 35
 material_type = Tough
 material_vendor = Monocure
-material_colour = #007EFD
+material_colour = #595959
 
 [sla_material:Monocure 3D Blue Rapid Resin @0.025]
 inherits = *common 0.025*
@@ -4826,7 +4826,7 @@ exposure_time = 5
 initial_exposure_time = 35
 material_type = Tough
 material_vendor = Prusa Polymers
-material_colour = #007EFD
+material_colour = #595959
 
 [sla_material:Prusament Resin Tough Anthracite Grey @0.025]
 inherits = *common 0.025*
@@ -4995,7 +4995,7 @@ exposure_time = 5
 initial_exposure_time = 35
 material_type = Tough
 material_vendor = Made for Prusa
-material_colour = #007EFD
+material_colour = #595959
 
 [sla_material:Prusa Deep Blue Transparent Tough @0.025]
 inherits = *common 0.025*
@@ -5131,7 +5131,7 @@ exposure_time = 4
 initial_exposure_time = 35
 material_type = Tough
 material_vendor = Zortrax
-material_colour = #007EFD
+material_colour = #595959
 
 ########### Materials 0.05
 
@@ -5253,7 +5253,7 @@ exposure_time = 6
 initial_exposure_time = 35
 material_type = Tough
 material_vendor = Monocure
-material_colour = #007EFD
+material_colour = #595959
 
 [sla_material:Monocure 3D Blue Rapid Resin @0.05]
 inherits = *common 0.05*
@@ -5309,7 +5309,7 @@ exposure_time = 7
 initial_exposure_time = 30
 material_type = Tough
 material_vendor = Esun
-material_colour = #007EFD
+material_colour = #595959
 
 [sla_material:FunToDo Castable Blend Red @0.05]
 inherits = *common 0.05*
@@ -5349,7 +5349,7 @@ exposure_time = 20
 initial_exposure_time = 40
 material_type = Tough
 material_vendor = 3DM
-material_colour = #007EFD
+material_colour = #595959
 
 [sla_material:3DM-DENT @0.05]
 inherits = *common 0.05*
@@ -5429,7 +5429,7 @@ exposure_time = 13
 initial_exposure_time = 20
 material_type = Tough
 material_vendor = Harz Labs
-material_colour = #007EFD
+material_colour = #595959
 
 [sla_material:Harz Labs Dental Cast Red @0.05]
 inherits = *common 0.05*
@@ -5533,7 +5533,7 @@ exposure_time = 9
 initial_exposure_time = 35
 material_type = Tough
 material_vendor = Siraya Tech
-material_colour = #007EFD
+material_colour = #595959
 
 [sla_material:NextDent Model 2.0 Grey @0.05]
 inherits = *common 0.05*
@@ -5621,7 +5621,7 @@ exposure_time = 7
 initial_exposure_time = 35
 material_type = Tough
 material_vendor = Zortrax
-material_colour = #007EFD
+material_colour = #595959
 
 ## Prusa Polymers 0.05
 
@@ -5639,7 +5639,7 @@ exposure_time = 6
 initial_exposure_time = 35
 material_type = Tough
 material_vendor = Prusa Polymers
-material_colour = #007EFD
+material_colour = #595959
 
 [sla_material:Prusament Resin Tough Anthracite Grey @0.05]
 inherits = *common 0.05*
@@ -5681,7 +5681,7 @@ exposure_time = 6
 initial_exposure_time = 35
 material_type = Tough
 material_vendor = Made for Prusa
-material_colour = #007EFD
+material_colour = #595959
 
 ## [sla_material:Prusa Super Low Odor Beige Tough @0.05]
 ## inherits = *common 0.05*
@@ -5901,7 +5901,7 @@ exposure_time = 8
 initial_exposure_time = 35
 material_type = Tough
 material_vendor = Made for Prusa
-material_colour = #007EFD
+material_colour = #595959
 
 [sla_material:Prusa Deep Blue Transparent Tough @0.05]
 inherits = *common 0.05*
@@ -5955,7 +5955,7 @@ exposure_time = 13
 initial_exposure_time = 45
 material_type = Tough
 material_vendor = Prusa Polymers
-material_colour = #007EFD
+material_colour = #595959
 
 [sla_material:Prusament Resin Tough Anthracite Grey @0.1]
 inherits = *common 0.1*
@@ -6021,7 +6021,7 @@ exposure_time = 13
 initial_exposure_time = 55
 material_type = Tough
 material_vendor = Made for Prusa
-material_colour = #007EFD
+material_colour = #595959
 
 [sla_material:Prusa Transparent Tough @0.1]
 inherits = *common 0.1*
@@ -6075,7 +6075,7 @@ exposure_time = 1.8
 initial_exposure_time = 25
 material_type = Tough
 material_vendor = Prusa Polymers
-material_colour = #007EFD
+material_colour = #595959
 
 [sla_material:Prusament Resin Tough Anthracite Grey @0.025 SL1S]
 inherits = *0.025_sl1s*
@@ -6117,7 +6117,7 @@ exposure_time = 2
 initial_exposure_time = 25
 material_type = Tough
 material_vendor = Made for Prusa
-material_colour = #007EFD
+material_colour = #595959
 
 [sla_material:Prusa Cyan Tough @0.025 SL1S]
 inherits = *0.025_sl1s*
@@ -6321,7 +6321,7 @@ exposure_time = 2
 initial_exposure_time = 25
 material_type = Tough
 material_vendor = Prusa Polymers
-material_colour = #007EFD
+material_colour = #595959
 
 [sla_material:Prusament Resin Tough Anthracite Grey @0.05 SL1S]
 inherits = *0.05_sl1s*
@@ -6363,7 +6363,7 @@ exposure_time = 2.4
 initial_exposure_time = 25
 material_type = Tough
 material_vendor = Made for Prusa
-material_colour = #007EFD
+material_colour = #595959
 
 [sla_material:Prusa Cyan Tough @0.05 SL1S]
 inherits = *0.05_sl1s*
@@ -6567,7 +6567,7 @@ exposure_time = 2.6
 initial_exposure_time = 25
 material_type = Tough
 material_vendor = Prusa Polymers
-material_colour = #007EFD
+material_colour = #595959
 
 [sla_material:Prusament Resin Tough Anthracite Grey @0.1 SL1S]
 inherits = *0.1_sl1s*
@@ -6609,7 +6609,7 @@ exposure_time = 3
 initial_exposure_time = 25
 material_type = Tough
 material_vendor = Made for Prusa
-material_colour = #007EFD
+material_colour = #595959
 
 [sla_material:Prusa Cyan Tough @0.1 SL1S]
 inherits = *0.1_sl1s*
diff --git a/src/libslic3r/AppConfig.cpp b/src/libslic3r/AppConfig.cpp
index b6406bf414..9c9e7e0f30 100644
--- a/src/libslic3r/AppConfig.cpp
+++ b/src/libslic3r/AppConfig.cpp
@@ -71,8 +71,6 @@ void AppConfig::set_defaults()
         if (get("drop_project_action").empty())
             set("drop_project_action", "1");
 
-        if (get("version_check").empty())
-            set("version_check", "1");
         if (get("preset_update").empty())
             set("preset_update", "1");
 
diff --git a/src/libslic3r/Model.cpp b/src/libslic3r/Model.cpp
index 55ca4b8da3..fec6e422c1 100644
--- a/src/libslic3r/Model.cpp
+++ b/src/libslic3r/Model.cpp
@@ -1893,7 +1893,7 @@ size_t ModelVolume::split(unsigned int max_extruders)
     // discard volumes for which the convex hull was not generated or is degenerate
     size_t i = 0;
     while (i < this->object->volumes.size()) {
-        std::shared_ptr<const TriangleMesh> hull = this->object->volumes[i]->get_convex_hull_shared_ptr();
+        const std::shared_ptr<const TriangleMesh> &hull = this->object->volumes[i]->get_convex_hull_shared_ptr();
         if (hull == nullptr || hull->its.vertices.empty() || hull->its.indices.empty()) {
             this->object->delete_volume(i);
             --idx;
diff --git a/src/libslic3r/Model.hpp b/src/libslic3r/Model.hpp
index e47ebda39a..3e11336afb 100644
--- a/src/libslic3r/Model.hpp
+++ b/src/libslic3r/Model.hpp
@@ -684,7 +684,7 @@ public:
 
     void                calculate_convex_hull();
     const TriangleMesh& get_convex_hull() const;
-    std::shared_ptr<const TriangleMesh> get_convex_hull_shared_ptr() const { return m_convex_hull; }
+    const std::shared_ptr<const TriangleMesh>& get_convex_hull_shared_ptr() const { return m_convex_hull; }
     // Get count of errors in the mesh
     int                 get_repaired_errors_count() const;
 
diff --git a/src/libslic3r/TriangleMesh.cpp b/src/libslic3r/TriangleMesh.cpp
index efd8e97f71..b33dd38cc5 100644
--- a/src/libslic3r/TriangleMesh.cpp
+++ b/src/libslic3r/TriangleMesh.cpp
@@ -1190,11 +1190,11 @@ std::vector<indexed_triangle_set> its_split(const indexed_triangle_set &its)
 }
 
 // Number of disconnected patches (faces are connected if they share an edge, shared edge defined with 2 shared vertex indices).
-bool its_number_of_patches(const indexed_triangle_set &its)
+size_t its_number_of_patches(const indexed_triangle_set &its)
 {
     return its_number_of_patches<>(its);
 }
-bool its_number_of_patches(const indexed_triangle_set &its, const std::vector<Vec3i> &face_neighbors)
+size_t its_number_of_patches(const indexed_triangle_set &its, const std::vector<Vec3i> &face_neighbors)
 {
     return its_number_of_patches<>(ItsNeighborsWrapper{ its, face_neighbors });
 }
diff --git a/src/libslic3r/TriangleMesh.hpp b/src/libslic3r/TriangleMesh.hpp
index 951e351fee..459917ab92 100644
--- a/src/libslic3r/TriangleMesh.hpp
+++ b/src/libslic3r/TriangleMesh.hpp
@@ -219,8 +219,8 @@ std::vector<indexed_triangle_set> its_split(const indexed_triangle_set &its);
 std::vector<indexed_triangle_set> its_split(const indexed_triangle_set &its, std::vector<Vec3i> &face_neighbors);
 
 // Number of disconnected patches (faces are connected if they share an edge, shared edge defined with 2 shared vertex indices).
-bool its_number_of_patches(const indexed_triangle_set &its);
-bool its_number_of_patches(const indexed_triangle_set &its, const std::vector<Vec3i> &face_neighbors);
+size_t its_number_of_patches(const indexed_triangle_set &its);
+size_t its_number_of_patches(const indexed_triangle_set &its, const std::vector<Vec3i> &face_neighbors);
 // Same as its_number_of_patches(its) > 1, but faster.
 bool its_is_splittable(const indexed_triangle_set &its);
 bool its_is_splittable(const indexed_triangle_set &its, const std::vector<Vec3i> &face_neighbors);
diff --git a/src/slic3r/GUI/ConfigWizard.cpp b/src/slic3r/GUI/ConfigWizard.cpp
index 762de2cf53..737c14317a 100644
--- a/src/slic3r/GUI/ConfigWizard.cpp
+++ b/src/slic3r/GUI/ConfigWizard.cpp
@@ -1206,7 +1206,7 @@ PageUpdate::PageUpdate(ConfigWizard *parent)
     boldfont.SetWeight(wxFONTWEIGHT_BOLD);
 
     auto *box_slic3r = new wxCheckBox(this, wxID_ANY, _L("Check for application updates"));
-    box_slic3r->SetValue(app_config->get("version_check") == "1");
+    box_slic3r->SetValue(app_config->get("notify_release") != "none");
     append(box_slic3r);
     append_text(wxString::Format(_L(
         "If enabled, %s checks for new application versions online. When a new version becomes available, "
@@ -2697,7 +2697,7 @@ bool ConfigWizard::priv::apply_config(AppConfig *app_config, PresetBundle *prese
 
     app_config->set_vendors(appconfig_new);
 
-    app_config->set("version_check", page_update->version_check ? "1" : "0");
+    app_config->set("notify_release", page_update->version_check ? "all" : "none");
     app_config->set("preset_update", page_update->preset_update ? "1" : "0");
     app_config->set("export_sources_full_pathnames", page_reload_from_disk->full_pathnames ? "1" : "0");
 
diff --git a/src/slic3r/GUI/GUI_App.cpp b/src/slic3r/GUI/GUI_App.cpp
index 9e92f1ac98..ad611114e4 100644
--- a/src/slic3r/GUI/GUI_App.cpp
+++ b/src/slic3r/GUI/GUI_App.cpp
@@ -83,6 +83,9 @@
 #include <wx/msw/dark_mode.h>
 #endif // _MSW_DARK_MODE
 #endif
+#ifdef _WIN32
+#include <boost/dll/runtime_symbol_info.hpp>
+#endif
 
 #if ENABLE_THUMBNAIL_GENERATOR_DEBUG
 #include <boost/beast/core/detail/base64.hpp>
@@ -424,6 +427,56 @@ bool static check_old_linux_datadir(const wxString& app_name) {
 #endif
 
 
+#ifdef _WIN32
+static bool run_updater_win()
+{
+    // find updater exe
+    boost::filesystem::path path_to_binary = boost::dll::program_location();
+    for (const auto& dir_entry : boost::filesystem::directory_iterator(path_to_binary.parent_path())) {
+        if (dir_entry.path().filename() == "prusaslicer-updater.exe") {
+            // run updater. Original args: /silent -restartapp prusa-slicer.exe -startappfirst
+
+            // Using quoted string as mentioned in CreateProcessW docs.
+            std::wstring wcmd = L"\"" + dir_entry.path().wstring() + L"\"";
+            wcmd += L" /silent";
+
+            // additional information
+            STARTUPINFOW si;
+            PROCESS_INFORMATION pi;
+
+            // set the size of the structures
+            ZeroMemory(&si, sizeof(si));
+            si.cb = sizeof(si);
+            ZeroMemory(&pi, sizeof(pi));
+
+            // start the program up
+            if (CreateProcessW(NULL,   // the path
+                wcmd.data(),    // Command line
+                NULL,           // Process handle not inheritable
+                NULL,           // Thread handle not inheritable
+                FALSE,          // Set handle inheritance to FALSE
+                0,              // No creation flags
+                NULL,           // Use parent's environment block
+                NULL,           // Use parent's starting directory 
+                &si,            // Pointer to STARTUPINFO structure
+                &pi             // Pointer to PROCESS_INFORMATION structure (removed extra parentheses)
+            )) {
+                // Close process and thread handles.
+                CloseHandle(pi.hProcess);
+                CloseHandle(pi.hThread);
+                return true;
+            } else {
+                BOOST_LOG_TRIVIAL(error) << "Failed to start prusaslicer-updater.exe with command " << wcmd;
+            }
+            break;
+        }
+    }
+    return false;
+}
+#endif //_WIN32
+
+
+
 wxString file_wildcards(FileType file_type, const std::string &custom_extension)
 {
     static const std::string defaults[FT_SIZE] = {
@@ -678,7 +731,6 @@ void GUI_App::post_init()
         this->check_updates(false);
         CallAfter([this] {
             bool cw_showed = this->config_wizard_startup();
-            this->preset_updater->slic3r_update_notify();
             this->preset_updater->sync(preset_bundle);
             if (! cw_showed) {
                 // The CallAfter is needed as well, without it, GL extensions did not show.
@@ -686,6 +738,15 @@ void GUI_App::post_init()
                 // sees something else than "we want something" on the first start.
                 show_send_system_info_dialog_if_needed();
             }
+            bool updater_running = 
+        #ifdef _WIN32
+            // Run external updater on Windows.
+            run_updater_win();
+        #else
+            false;
+        #endif // _WIN32
+            if (!updater_running)
+                this->preset_updater->slic3r_update_notify();
         });
     }
 
@@ -1070,26 +1131,30 @@ bool GUI_App::on_init_inner()
         Bind(EVT_SLIC3R_VERSION_ONLINE, [this](const wxCommandEvent& evt) {
             app_config->set("version_online", into_u8(evt.GetString()));
             app_config->save();
-            if (this->plater_ != nullptr) {
+            std::string opt = app_config->get("notify_release");
+            if (this->plater_ != nullptr && (opt == "all" || opt == "release")) {
                 if (*Semver::parse(SLIC3R_VERSION) < *Semver::parse(into_u8(evt.GetString()))) {
-                    this->plater_->get_notification_manager()->push_notification(NotificationType::NewAppAvailable);
+                    this->plater_->get_notification_manager()->push_notification(NotificationType::NewAppAvailable
+                        , NotificationManager::NotificationLevel::ImportantNotificationLevel
+                        , Slic3r::format(_u8L("New release version %1% is available."), evt.GetString())
+                        , _u8L("See Download page.")
+                        , [](wxEvtHandler* evnthndlr) {wxGetApp().open_web_page_localized("https://www.prusa3d.com/slicerweb"); return true; }
+                    );
                 }
             }
             });
-        Bind(EVT_SLIC3R_ALPHA_VERSION_ONLINE, [this](const wxCommandEvent& evt) {
+        Bind(EVT_SLIC3R_EXPERIMENTAL_VERSION_ONLINE, [this](const wxCommandEvent& evt) {
             app_config->save();
-            if (this->plater_ != nullptr && app_config->get("notify_testing_release") == "1") {
-                if (*Semver::parse(SLIC3R_VERSION) < *Semver::parse(into_u8(evt.GetString()))) {
-                    this->plater_->get_notification_manager()->push_notification(NotificationType::NewAlphaAvailable);
-                }
-            }
-            });
-        Bind(EVT_SLIC3R_BETA_VERSION_ONLINE, [this](const wxCommandEvent& evt) {
-            app_config->save();
-            if (this->plater_ != nullptr && app_config->get("notify_testing_release") == "1") {
-                if (*Semver::parse(SLIC3R_VERSION) < *Semver::parse(into_u8(evt.GetString()))) {
-                    this->plater_->get_notification_manager()->close_notification_of_type(NotificationType::NewAlphaAvailable);
-                    this->plater_->get_notification_manager()->push_notification(NotificationType::NewBetaAvailable);
+            if (this->plater_ != nullptr && app_config->get("notify_release") == "all") {
+                std::string evt_string = into_u8(evt.GetString());
+                if (*Semver::parse(SLIC3R_VERSION) < *Semver::parse(evt_string)) {
+                    auto notif_type = (evt_string.find("beta") != std::string::npos ? NotificationType::NewBetaAvailable : NotificationType::NewAlphaAvailable);
+                    this->plater_->get_notification_manager()->push_notification( notif_type
+                        , NotificationManager::NotificationLevel::ImportantNotificationLevel
+                        , Slic3r::format(_u8L("New prerelease version %1% is available."), evt_string)
+                        , _u8L("See Releases page.")
+                        , [](wxEvtHandler* evnthndlr) {wxGetApp().open_browser_with_warning_dialog("https://github.com/prusa3d/PrusaSlicer/releases"); return true; }
+                    );
                 }
             }
             });
@@ -2032,7 +2097,7 @@ void GUI_App::add_config_menu(wxMenuBar *menu)
         local_menu->Append(config_id_base + ConfigMenuWizard, config_wizard_name + dots, config_wizard_tooltip);
         local_menu->Append(config_id_base + ConfigMenuSnapshots, _L("&Configuration Snapshots") + dots, _L("Inspect / activate configuration snapshots"));
         local_menu->Append(config_id_base + ConfigMenuTakeSnapshot, _L("Take Configuration &Snapshot"), _L("Capture a configuration snapshot"));
-        local_menu->Append(config_id_base + ConfigMenuUpdate, _L("Check for updates"), _L("Check for configuration updates"));
+        local_menu->Append(config_id_base + ConfigMenuUpdate, _L("Check for Configuration Updates"), _L("Check for configuration updates"));
 #if defined(__linux__) && defined(SLIC3R_DESKTOP_INTEGRATION) 
         //if (DesktopIntegrationDialog::integration_possible())
         local_menu->Append(config_id_base + ConfigMenuDesktopIntegration, _L("Desktop Integration"), _L("Desktop Integration"));    
diff --git a/src/slic3r/GUI/GalleryDialog.cpp b/src/slic3r/GUI/GalleryDialog.cpp
index f5e3083a78..2aba75fbac 100644
--- a/src/slic3r/GUI/GalleryDialog.cpp
+++ b/src/slic3r/GUI/GalleryDialog.cpp
@@ -101,7 +101,7 @@ GalleryDialog::GalleryDialog(wxWindow* parent, bool modify_gallery/* = false*/)
         ok_btn->SetToolTip(_L("Add selected shape(s) to the bed"));
     }
     static_cast<wxButton*>(FindWindowById(wxID_CLOSE, this))->Bind(wxEVT_BUTTON, [this](wxCommandEvent&){ this->EndModal(wxID_CLOSE); });
-
+    this->SetEscapeId(wxID_CLOSE);
     auto add_btn = [this, buttons]( size_t pos, int& ID, wxString title, wxString tooltip,
                                     void (GalleryDialog::* method)(wxEvent&), 
                                     std::function<bool()> enable_fn = []() {return true; }) {
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoRotate.cpp b/src/slic3r/GUI/Gizmos/GLGizmoRotate.cpp
index c6fb13e14b..166bfa402b 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoRotate.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoRotate.cpp
@@ -585,9 +585,21 @@ GLGizmoRotate3D::RotoptimzeWindow::RotoptimzeWindow(ImGuiWrapper *   imgui,
     y = std::min(y, alignment.bottom_limit - win_h);
     ImGui::SetWindowPos(ImVec2(x, y), ImGuiCond_Always);
 
-    ImGui::PushItemWidth(300.f);
+    float max_text_w = 0.;
+    auto padding = ImGui::GetStyle().FramePadding;
+    padding.x *= 2.f;
+    padding.y *= 2.f;
 
-    if (ImGui::BeginCombo(_L("Choose goal").c_str(), RotoptimizeJob::get_method_name(state.method_id).c_str())) {
+    for (size_t i = 0; i < RotoptimizeJob::get_methods_count(); ++i) {
+        float w =
+            ImGui::CalcTextSize(RotoptimizeJob::get_method_name(i).c_str()).x +
+            padding.x + ImGui::GetFrameHeight();
+        max_text_w = std::max(w, max_text_w);
+    }
+
+    ImGui::PushItemWidth(max_text_w);
+
+    if (ImGui::BeginCombo("", RotoptimizeJob::get_method_name(state.method_id).c_str())) {
         for (size_t i = 0; i < RotoptimizeJob::get_methods_count(); ++i) {
             if (ImGui::Selectable(RotoptimizeJob::get_method_name(i).c_str())) {
                 state.method_id = i;
@@ -603,12 +615,18 @@ GLGizmoRotate3D::RotoptimzeWindow::RotoptimzeWindow(ImGuiWrapper *   imgui,
         ImGui::EndCombo();
     }
 
+    ImVec2 sz = ImGui::GetItemRectSize();
+
     if (ImGui::IsItemHovered())
         ImGui::SetTooltip("%s", RotoptimizeJob::get_method_description(state.method_id).c_str());
 
     ImGui::Separator();
 
-    if ( imgui->button(_L("Optimize")) ) {
+    auto btn_txt = _L("Apply");
+    auto btn_txt_sz = ImGui::CalcTextSize(btn_txt.c_str());
+    ImVec2 button_sz = {btn_txt_sz.x + padding.x, btn_txt_sz.y + padding.y};
+    ImGui::SetCursorPosX(padding.x + sz.x - button_sz.x);
+    if ( imgui->button(btn_txt) ) {
         wxGetApp().plater()->optimize_rotation();
     }
 }
diff --git a/src/slic3r/GUI/ImGuiWrapper.cpp b/src/slic3r/GUI/ImGuiWrapper.cpp
index 08e53b829e..5dd5da9f39 100644
--- a/src/slic3r/GUI/ImGuiWrapper.cpp
+++ b/src/slic3r/GUI/ImGuiWrapper.cpp
@@ -1189,6 +1189,7 @@ void ImGuiWrapper::init_input()
     io.KeyMap[ImGuiKey_Backspace] = WXK_BACK;
     io.KeyMap[ImGuiKey_Space] = WXK_SPACE;
     io.KeyMap[ImGuiKey_Enter] = WXK_RETURN;
+    io.KeyMap[ImGuiKey_KeyPadEnter] = WXK_NUMPAD_ENTER;
     io.KeyMap[ImGuiKey_Escape] = WXK_ESCAPE;
     io.KeyMap[ImGuiKey_A] = 'A';
     io.KeyMap[ImGuiKey_C] = 'C';
diff --git a/src/slic3r/GUI/ImGuiWrapper.hpp b/src/slic3r/GUI/ImGuiWrapper.hpp
index a56af22363..acad85c27b 100644
--- a/src/slic3r/GUI/ImGuiWrapper.hpp
+++ b/src/slic3r/GUI/ImGuiWrapper.hpp
@@ -6,6 +6,8 @@
 
 #include <imgui/imgui.h>
 
+#include <wx/string.h>
+
 #include "libslic3r/Point.hpp"
 
 namespace Slic3r {namespace Search {
diff --git a/src/slic3r/GUI/MsgDialog.cpp b/src/slic3r/GUI/MsgDialog.cpp
index 1cf5224174..961dfb5f3b 100644
--- a/src/slic3r/GUI/MsgDialog.cpp
+++ b/src/slic3r/GUI/MsgDialog.cpp
@@ -63,9 +63,9 @@ MsgDialog::MsgDialog(wxWindow *parent, const wxString &title, const wxString &he
 	SetSizerAndFit(main_sizer);
 }
 
-void MsgDialog::add_btn(wxWindowID btn_id, bool set_focus /*= false*/)
+void MsgDialog::add_btn(wxWindowID btn_id, bool set_focus /*= false*/, const wxString& label/* = wxString()*/)
 {
-    wxButton* btn = new wxButton(this, btn_id);
+    wxButton* btn = new wxButton(this, btn_id, label);
     if (set_focus)
         btn->SetFocus();
     btn_sizer->Add(btn, 0, wxLEFT | wxALIGN_CENTER_VERTICAL, HORIZ_SPACING);
@@ -75,7 +75,7 @@ void MsgDialog::add_btn(wxWindowID btn_id, bool set_focus /*= false*/)
 void MsgDialog::apply_style(long style)
 {
     if (style & wxOK)       add_btn(wxID_OK, true);
-    if (style & wxYES)      add_btn(wxID_YES);
+    if (style & wxYES)      add_btn(wxID_YES, true);
     if (style & wxNO)       add_btn(wxID_NO);
     if (style & wxCANCEL)   add_btn(wxID_CANCEL);
 
@@ -118,7 +118,7 @@ static void add_msg_content(wxWindow* parent, wxBoxSizer* content_sizer, wxStrin
     wxFont      font = wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT);
     wxFont      monospace = wxGetApp().code_font();
     wxColour    text_clr = wxGetApp().get_label_clr_default();
-    wxColour    bgr_clr = wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW);
+    wxColour    bgr_clr = parent->GetBackgroundColour(); //wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW);
     auto        text_clr_str = wxString::Format(wxT("#%02X%02X%02X"), text_clr.Red(), text_clr.Green(), text_clr.Blue());
     auto        bgr_clr_str = wxString::Format(wxT("#%02X%02X%02X"), bgr_clr.Red(), bgr_clr.Green(), bgr_clr.Blue());
     const int   font_size = font.GetPointSize();
diff --git a/src/slic3r/GUI/MsgDialog.hpp b/src/slic3r/GUI/MsgDialog.hpp
index e49c29b857..b2d0a157bc 100644
--- a/src/slic3r/GUI/MsgDialog.hpp
+++ b/src/slic3r/GUI/MsgDialog.hpp
@@ -43,7 +43,7 @@ protected:
 
 	MsgDialog(wxWindow *parent, const wxString &title, const wxString &headline, long style = wxOK, wxBitmap bitmap = wxNullBitmap);
 
-	void add_btn(wxWindowID btn_id, bool set_focus = false);
+	void add_btn(wxWindowID btn_id, bool set_focus = false, const wxString& label = wxString());
 	void apply_style(long style);
 	void finalize();
 
diff --git a/src/slic3r/GUI/NotificationManager.cpp b/src/slic3r/GUI/NotificationManager.cpp
index 0af8e32f5e..bcef85107b 100644
--- a/src/slic3r/GUI/NotificationManager.cpp
+++ b/src/slic3r/GUI/NotificationManager.cpp
@@ -41,12 +41,6 @@ const NotificationManager::NotificationData NotificationManager::basic_notificat
 			return true;
 		}
 	},
-	{NotificationType::NewAppAvailable, NotificationLevel::ImportantNotificationLevel, 20,  _u8L("New version is available."),  _u8L("See Releases page."), [](wxEvtHandler* evnthndlr) {
-		wxGetApp().open_browser_with_warning_dialog("https://github.com/prusa3d/PrusaSlicer/releases"); return true; }},
-	{NotificationType::NewAlphaAvailable, NotificationLevel::ImportantNotificationLevel, 20,  _u8L("New alpha release is available."),  _u8L("See Releases page."), [](wxEvtHandler* evnthndlr) {
-		wxGetApp().open_browser_with_warning_dialog("https://github.com/prusa3d/PrusaSlicer/releases"); return true; }},
-	{NotificationType::NewBetaAvailable, NotificationLevel::ImportantNotificationLevel, 20,  _u8L("New beta release is available."),  _u8L("See Releases page."), [](wxEvtHandler* evnthndlr) {
-		wxGetApp().open_browser_with_warning_dialog("https://github.com/prusa3d/PrusaSlicer/releases"); return true; }},
 	{NotificationType::EmptyColorChangeCode, NotificationLevel::PrintInfoNotificationLevel, 10,
 		_u8L("You have just added a G-code for color change, but its value is empty.\n"
 			 "To export the G-code correctly, check the \"Color Change G-code\" in \"Printer Settings > Custom G-code\"") },
@@ -61,6 +55,8 @@ const NotificationManager::NotificationData NotificationManager::basic_notificat
 	{NotificationType::UndoDesktopIntegrationFail, NotificationLevel::WarningNotificationLevel, 10,
 		_u8L("Undo desktop integration failed.") },
 	{NotificationType::ExportOngoing, NotificationLevel::RegularNotificationLevel, 0, _u8L("Exporting.") },
+	//{NotificationType::NewAppAvailable, NotificationLevel::ImportantNotificationLevel, 20,  _u8L("New version is available."),  _u8L("See Releases page."), [](wxEvtHandler* evnthndlr) {
+	//	wxGetApp().open_browser_with_warning_dialog("https://github.com/prusa3d/PrusaSlicer/releases"); return true; }},
 	//{NotificationType::NewAppAvailable, NotificationLevel::ImportantNotificationLevel, 20,  _u8L("New vesion of PrusaSlicer is available.",  _u8L("Download page.") },
 	//{NotificationType::LoadingFailed, NotificationLevel::RegularNotificationLevel, 20,  _u8L("Loading of model has Failed") },
 	//{NotificationType::DeviceEjected, NotificationLevel::RegularNotificationLevel, 10,  _u8L("Removable device has been safely ejected")} // if we want changeble text (like here name of device), we need to do it as CustomNotification
diff --git a/src/slic3r/GUI/NotificationManager.hpp b/src/slic3r/GUI/NotificationManager.hpp
index 6c50f64070..f162182dcc 100644
--- a/src/slic3r/GUI/NotificationManager.hpp
+++ b/src/slic3r/GUI/NotificationManager.hpp
@@ -150,7 +150,7 @@ public:
 	// Push a NotificationType::CustomNotification with NotificationLevel::RegularNotificationLevel and 10s fade out interval.
 	void push_notification(const std::string& text, int timestamp = 0);
 	// Push a NotificationType::CustomNotification with provided notification level and 10s for RegularNotificationLevel.
-	// ErrorNotificationLevel and ImportantNotificationLevel are never faded out.
+	// ErrorNotificationLevel are never faded out.
     void push_notification(NotificationType type, NotificationLevel level, const std::string& text, const std::string& hypertext = "",
                            std::function<bool(wxEvtHandler*)> callback = std::function<bool(wxEvtHandler*)>(), int timestamp = 0);
 	// Pushes basic_notification with delay. See push_delayed_notification_data.
@@ -720,7 +720,7 @@ private:
 		
 		case NotificationLevel::ErrorNotificationLevel: 			return 0;
 		case NotificationLevel::WarningNotificationLevel:			return 0;
-		case NotificationLevel::ImportantNotificationLevel:			return 0;
+		case NotificationLevel::ImportantNotificationLevel:			return 20;
 		case NotificationLevel::ProgressBarNotificationLevel:		return 2;
 		case NotificationLevel::PrintInfoShortNotificationLevel:	return 5;
 		case NotificationLevel::RegularNotificationLevel: 			return 10;
diff --git a/src/slic3r/GUI/PhysicalPrinterDialog.cpp b/src/slic3r/GUI/PhysicalPrinterDialog.cpp
index 22ced12e41..3d528df4b7 100644
--- a/src/slic3r/GUI/PhysicalPrinterDialog.cpp
+++ b/src/slic3r/GUI/PhysicalPrinterDialog.cpp
@@ -534,7 +534,7 @@ void PhysicalPrinterDialog::update_host_type(bool printer_change)
                     [model_id](const VendorProfile::PrinterModel& model) { return model.id == model_id; });
                 if (it != models.end() && (it->family == "MK3" || it->family == "MINI"))
                     continue;
-            } else if (!preset->vendor && (boost::ends_with(model_id, "MK3") || boost::ends_with(model_id, "MINI"))) {
+            } else if (!preset->vendor && (boost::starts_with(model_id, "MK3") || boost::starts_with(model_id, "MINI"))) {
                 continue;
             }
             
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 13ae9e7c0a..2a41bce067 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -5071,6 +5071,7 @@ void Plater::new_project()
     Plater::SuppressSnapshots suppress(this);
     reset();
     reset_project_dirty_initial_presets();
+    wxGetApp().update_saved_preset_from_current_preset();
     update_project_dirty_from_presets();
 }
 
diff --git a/src/slic3r/GUI/Preferences.cpp b/src/slic3r/GUI/Preferences.cpp
index c73fd40644..332de64cb2 100644
--- a/src/slic3r/GUI/Preferences.cpp
+++ b/src/slic3r/GUI/Preferences.cpp
@@ -141,14 +141,6 @@ void PreferencesDialog::build(size_t selected_tab)
 		option = Option(def, "background_processing");
 		m_optgroup_general->append_single_option_line(option);
 
-		// Please keep in sync with ConfigWizard
-		def.label = L("Check for application updates");
-		def.type = coBool;
-		def.tooltip = L("If enabled, PrusaSlicer will check for the new versions of itself online. When a new version becomes available a notification is displayed at the next application startup (never during program usage). This is only a notification mechanisms, no automatic installation is done.");
-		def.set_default_value(new ConfigOptionBool(app_config->get("version_check") == "1"));
-		option = Option(def, "version_check");
-		m_optgroup_general->append_single_option_line(option);
-
 		m_optgroup_general->append_separator();
 
 		// Please keep in sync with ConfigWizard
diff --git a/src/slic3r/GUI/PrintHostDialogs.cpp b/src/slic3r/GUI/PrintHostDialogs.cpp
index 4fd45f380a..313df2f77d 100644
--- a/src/slic3r/GUI/PrintHostDialogs.cpp
+++ b/src/slic3r/GUI/PrintHostDialogs.cpp
@@ -39,7 +39,7 @@ static const char *CONFIG_KEY_PRINT = "printhost_print";
 static const char *CONFIG_KEY_GROUP = "printhost_group";
 
 PrintHostSendDialog::PrintHostSendDialog(const fs::path &path, bool can_start_print, const wxArrayString &groups)
-    : MsgDialog(static_cast<wxWindow*>(wxGetApp().mainframe), _L("Send G-Code to printer host"), _L("Upload to Printer Host with the following filename:"), wxID_NONE)
+    : MsgDialog(static_cast<wxWindow*>(wxGetApp().mainframe), _L("Send G-Code to printer host"), _L("Upload to Printer Host with the following filename:"), wxOK | wxCANCEL)
     , txt_filename(new wxTextCtrl(this, wxID_ANY))
     , box_print(can_start_print ? new wxCheckBox(this, wxID_ANY, _L("Start printing after upload")) : nullptr)
     , combo_groups(!groups.IsEmpty() ? new wxComboBox(this, wxID_ANY, wxEmptyString, wxDefaultPosition, wxDefaultSize, groups, wxCB_READONLY) : nullptr)
@@ -70,10 +70,6 @@ PrintHostSendDialog::PrintHostSendDialog(const fs::path &path, bool can_start_pr
             combo_groups->SetValue(recent_group);
     }
 
-    auto* szr = CreateStdDialogButtonSizer(wxOK | wxCANCEL);
-    auto* btn_ok = szr->GetAffirmativeButton();
-    btn_sizer->Add(szr);
-    
     wxString recent_path = from_u8(app_config->get("recent", CONFIG_KEY_PATH));
     if (recent_path.Length() > 0 && recent_path[recent_path.Length() - 1] != '/') {
         recent_path += '/';
@@ -88,23 +84,19 @@ PrintHostSendDialog::PrintHostSendDialog(const fs::path &path, bool can_start_pr
     
     wxString suffix = recent_path.substr(recent_path.find_last_of('.'));
 
-    btn_ok->Bind(wxEVT_BUTTON, [this, suffix](wxCommandEvent&) {
+    static_cast<wxButton*>(FindWindowById(wxID_OK, this))->Bind(wxEVT_BUTTON, [this, suffix](wxCommandEvent&) {
         wxString path = txt_filename->GetValue();
         // .gcode suffix control
         if (!path.Lower().EndsWith(suffix.Lower()))
         {
-            //wxMessageDialog msg_wingow(this, wxString::Format(_L("Upload filename doesn't end with \"%s\". Do you wish to continue?"), suffix), wxString(SLIC3R_APP_NAME), wxYES | wxNO);
             MessageDialog msg_wingow(this, wxString::Format(_L("Upload filename doesn't end with \"%s\". Do you wish to continue?"), suffix), wxString(SLIC3R_APP_NAME), wxYES | wxNO);
             if (msg_wingow.ShowModal() == wxID_NO)
                 return;
         }
         EndDialog(wxID_OK);
-        });
+    });
 
-    wxGetApp().UpdateDlgDarkUI(this);
-
-    Fit();
-    CenterOnParent();
+    finalize();
 
 #ifdef __linux__
     // On Linux with GTK2 when text control lose the focus then selection (colored background) disappears but text color stay white
diff --git a/src/slic3r/GUI/UpdateDialogs.cpp b/src/slic3r/GUI/UpdateDialogs.cpp
index d617ca6608..b929141a04 100644
--- a/src/slic3r/GUI/UpdateDialogs.cpp
+++ b/src/slic3r/GUI/UpdateDialogs.cpp
@@ -26,7 +26,7 @@ namespace GUI {
 
 
 static const char* URL_CHANGELOG = "https://files.prusa3d.com/?latest=slicer-stable&lng=%1%";
-static const char* URL_DOWNLOAD = "https://www.prusa3d.com/downloads&lng=%1%";
+static const char* URL_DOWNLOAD = "https://www.prusa3d.com/slicerweb&lng=%1%";
 static const char* URL_DEV = "https://github.com/prusa3d/PrusaSlicer/releases/tag/version_%1%";
 
 static const std::string CONFIG_UPDATE_WIKI_URL("https://github.com/prusa3d/PrusaSlicer/wiki/Slic3r-PE-1.40-configuration-update");
@@ -89,7 +89,7 @@ MsgUpdateConfig::MsgUpdateConfig(const std::vector<Update> &updates, bool force_
 	MsgDialog(nullptr, force_before_wizard ? _L("Opening Configuration Wizard") : _L("Configuration update"), 
 					   force_before_wizard ? _L("PrusaSlicer is not using the newest configuration available.\n"
 												"Configuration Wizard may not offer the latest printers, filaments and SLA materials to be installed. ") : 
-											 _L("Configuration update is available"), wxID_NONE)
+											 _L("Configuration update is available"), wxICON_ERROR)
 {
 	auto *text = new wxStaticText(this, wxID_ANY, _(L(
 		"Would you like to install it?\n\n"
@@ -133,22 +133,14 @@ MsgUpdateConfig::MsgUpdateConfig(const std::vector<Update> &updates, bool force_
 	content_sizer->Add(versions);
 	content_sizer->AddSpacer(2*VERT_SPACING);
 
-	auto* btn_ok = new wxButton(this, wxID_OK, force_before_wizard ? _L("Install") : "OK");
-	btn_sizer->Add(btn_ok);
-	btn_sizer->AddSpacer(HORIZ_SPACING);
+	add_btn(wxID_OK, true, force_before_wizard ? _L("Install") : "OK");
 	if (force_before_wizard) {
-		auto* btn_no_install = new wxButton(this, wxID_ANY, "Don't install");
-		btn_no_install->Bind(wxEVT_BUTTON, [this](wxEvent&) { this->EndModal(wxID_CLOSE); });
-		btn_sizer->Add(btn_no_install);
-		btn_sizer->AddSpacer(HORIZ_SPACING);
+		add_btn(wxID_CLOSE, false, _L("Don't install"));
+		static_cast<wxButton*>(FindWindowById(wxID_CLOSE, this))->Bind(wxEVT_BUTTON, [this](const wxCommandEvent&) { this->EndModal(wxID_CLOSE); });
 	}
-	auto* btn_cancel = new wxButton(this, wxID_CANCEL);
-	btn_sizer->Add(btn_cancel);
-	btn_ok->SetFocus();
+	add_btn(wxID_CANCEL);
 
-	wxGetApp().UpdateDlgDarkUI(this);
-
-	Fit();
+	finalize();
 }
 
 MsgUpdateConfig::~MsgUpdateConfig() {}
@@ -156,7 +148,7 @@ MsgUpdateConfig::~MsgUpdateConfig() {}
 //MsgUpdateForced
 
 MsgUpdateForced::MsgUpdateForced(const std::vector<Update>& updates) :
-    MsgDialog(nullptr, wxString::Format(_(L("%s incompatibility")), SLIC3R_APP_NAME), _(L("You must install a configuration update.")) + " ", wxICON_ERROR)
+    MsgDialog(nullptr, wxString::Format(_(L("%s incompatibility")), SLIC3R_APP_NAME), _(L("You must install a configuration update.")) + " ", wxOK | wxICON_ERROR)
 {
 	auto* text = new wxStaticText(this, wxID_ANY, wxString::Format(_(L(
 		"%s will now start updates. Otherwise it won't be able to start.\n\n"
@@ -197,17 +189,10 @@ MsgUpdateForced::MsgUpdateForced(const std::vector<Update>& updates) :
 
 	content_sizer->Add(versions);
 	content_sizer->AddSpacer(2 * VERT_SPACING);
-	
-	auto* btn_exit = new wxButton(this, wxID_EXIT, wxString::Format(_(L("Exit %s")), SLIC3R_APP_NAME));
-	btn_sizer->Add(btn_exit);
-	btn_sizer->AddSpacer(HORIZ_SPACING);
-	auto* btn_ok = new wxButton(this, wxID_OK);
-	btn_sizer->Add(btn_ok);
-	btn_ok->SetFocus();
 
-	auto exiter = [this](const wxCommandEvent& evt) { this->EndModal(evt.GetId()); };
-	btn_exit->Bind(wxEVT_BUTTON, exiter);
-	btn_ok->Bind(wxEVT_BUTTON, exiter);
+	add_btn(wxID_EXIT, false, wxString::Format(_L("Exit %s"), SLIC3R_APP_NAME));
+	for (auto ID : { wxID_EXIT, wxID_OK })
+		static_cast<wxButton*>(FindWindowById(ID, this))->Bind(wxEVT_BUTTON, [this](const wxCommandEvent& evt) { this->EndModal(evt.GetId()); });
 
 	finalize();
 }
@@ -218,7 +203,7 @@ MsgUpdateForced::~MsgUpdateForced() {}
 
 MsgDataIncompatible::MsgDataIncompatible(const std::unordered_map<std::string, wxString> &incompats) :
     MsgDialog(nullptr, wxString::Format(_(L("%s incompatibility")), SLIC3R_APP_NAME), 
-                       wxString::Format(_(L("%s configuration is incompatible")), SLIC3R_APP_NAME), /*wxID_NONE | */wxICON_ERROR)
+                       wxString::Format(_(L("%s configuration is incompatible")), SLIC3R_APP_NAME), wxICON_ERROR)
 {
 	auto *text = new wxStaticText(this, wxID_ANY, wxString::Format(_(L(
 		"This version of %s is not compatible with currently installed configuration bundles.\n"
@@ -251,16 +236,11 @@ MsgDataIncompatible::MsgDataIncompatible(const std::unordered_map<std::string, w
 	content_sizer->Add(versions);
 	content_sizer->AddSpacer(2*VERT_SPACING);
 
-    auto *btn_exit = new wxButton(this, wxID_EXIT, wxString::Format(_(L("Exit %s")), SLIC3R_APP_NAME));
-	btn_sizer->Add(btn_exit);
-	btn_sizer->AddSpacer(HORIZ_SPACING);
-	auto *btn_reconf = new wxButton(this, wxID_REPLACE, _(L("Re-configure")));
-	btn_sizer->Add(btn_reconf);
-	btn_exit->SetFocus();
+	add_btn(wxID_REPLACE, true, _L("Re-configure"));
+	add_btn(wxID_EXIT, false, wxString::Format(_L("Exit %s"), SLIC3R_APP_NAME));
 
-	auto exiter = [this](const wxCommandEvent& evt) { this->EndModal(evt.GetId()); };
-	btn_exit->Bind(wxEVT_BUTTON, exiter);
-	btn_reconf->Bind(wxEVT_BUTTON, exiter);
+	for (auto ID : {wxID_EXIT, wxID_REPLACE})
+		static_cast<wxButton*>(FindWindowById(ID, this))->Bind(wxEVT_BUTTON, [this](const wxCommandEvent& evt) { this->EndModal(evt.GetId()); });
 
 	finalize();
 }
@@ -309,7 +289,7 @@ MsgDataLegacy::~MsgDataLegacy() {}
 // MsgNoUpdate
 
 MsgNoUpdates::MsgNoUpdates() :
-    MsgDialog(nullptr, _(L("Configuration updates")), _(L("No updates available")), wxICON_ERROR)
+    MsgDialog(nullptr, _(L("Configuration updates")), _(L("No updates available")), wxICON_ERROR | wxOK)
 {
 
 	auto* text = new wxStaticText(this, wxID_ANY, wxString::Format(
diff --git a/src/slic3r/Utils/PresetUpdater.cpp b/src/slic3r/Utils/PresetUpdater.cpp
index 76ecc76d9f..1d9d287bb5 100644
--- a/src/slic3r/Utils/PresetUpdater.cpp
+++ b/src/slic3r/Utils/PresetUpdater.cpp
@@ -137,8 +137,7 @@ struct Updates
 
 
 wxDEFINE_EVENT(EVT_SLIC3R_VERSION_ONLINE, wxCommandEvent);
-wxDEFINE_EVENT(EVT_SLIC3R_ALPHA_VERSION_ONLINE, wxCommandEvent);
-wxDEFINE_EVENT(EVT_SLIC3R_BETA_VERSION_ONLINE, wxCommandEvent);
+wxDEFINE_EVENT(EVT_SLIC3R_EXPERIMENTAL_VERSION_ONLINE, wxCommandEvent);
 
 struct PresetUpdater::priv
 {
@@ -189,7 +188,7 @@ PresetUpdater::priv::priv()
 // Pull relevant preferences from AppConfig
 void PresetUpdater::priv::set_download_prefs(AppConfig *app_config)
 {
-	enabled_version_check = app_config->get("version_check") == "1";
+	enabled_version_check = app_config->get("notify_release") != "none";
 	version_check_url = app_config->version_check_url();
 	enabled_config_update = app_config->get("preset_update") == "1" && !app_config->legacy_datadir();
 }
@@ -276,8 +275,9 @@ void PresetUpdater::priv::parse_version_string(const std::string& body) const
 		version = body.substr(0, first_nl_pos);
 	else
 		version = body;
-	if (!Semver::parse(version)) {
-		BOOST_LOG_TRIVIAL(warning) << format("Received invalid contents from `%1%`: Not a correct semver: `%2%`", SLIC3R_APP_NAME, version);
+	boost::optional<Semver> release_version = Semver::parse(version);
+	if (!release_version) {
+		BOOST_LOG_TRIVIAL(error) << format("Received invalid contents from `%1%`: Not a correct semver: `%2%`", SLIC3R_APP_NAME, version);
 		return;
 	}
 	BOOST_LOG_TRIVIAL(info) << format("Got %1% online version: `%2%`. Sending to GUI thread...", SLIC3R_APP_NAME, version);
@@ -286,6 +286,7 @@ void PresetUpdater::priv::parse_version_string(const std::string& body) const
 	GUI::wxGetApp().QueueEvent(evt);
 
 	// alpha / beta version
+	std::vector<std::string> prerelease_versions;
 	size_t nexn_nl_pos = first_nl_pos;
 	while (nexn_nl_pos != std::string::npos && body.size() > nexn_nl_pos + 1) {
 		const auto last_nl_pos = nexn_nl_pos;
@@ -300,28 +301,36 @@ void PresetUpdater::priv::parse_version_string(const std::string& body) const
 		if (line.substr(0, 6) == "alpha=") {
 			version = line.substr(6);
 			if (!Semver::parse(version)) {
-				BOOST_LOG_TRIVIAL(warning) << format("Received invalid contents for alpha release from `%1%`: Not a correct semver: `%2%`", SLIC3R_APP_NAME, version);
+				BOOST_LOG_TRIVIAL(error) << format("Received invalid contents for alpha release from `%1%`: Not a correct semver: `%2%`", SLIC3R_APP_NAME, version);
 				return;
 			}
-			BOOST_LOG_TRIVIAL(info) << format("Got %1% online version of alpha release: `%2%`. Sending to GUI thread...", SLIC3R_APP_NAME, version);
-			wxCommandEvent* evt = new wxCommandEvent(EVT_SLIC3R_ALPHA_VERSION_ONLINE);
-			evt->SetString(GUI::from_u8(version));
-			GUI::wxGetApp().QueueEvent(evt);
-
+			prerelease_versions.emplace_back(version);
 		// beta
 		}
 		else if (line.substr(0, 5) == "beta=") {
 			version = line.substr(5);
 			if (!Semver::parse(version)) {
-				BOOST_LOG_TRIVIAL(warning) << format("Received invalid contents for beta release from `%1%`: Not a correct semver: `%2%`", SLIC3R_APP_NAME, version);
+				BOOST_LOG_TRIVIAL(error) << format("Received invalid contents for beta release from `%1%`: Not a correct semver: `%2%`", SLIC3R_APP_NAME, version);
 				return;
 			}
-			BOOST_LOG_TRIVIAL(info) << format("Got %1% online version of beta release: `%2%`. Sending to GUI thread...", SLIC3R_APP_NAME, version);
-			wxCommandEvent* evt = new wxCommandEvent(EVT_SLIC3R_BETA_VERSION_ONLINE);
-			evt->SetString(GUI::from_u8(version));
-			GUI::wxGetApp().QueueEvent(evt);
+			prerelease_versions.emplace_back(version);
 		}
 	}
+	// find recent version that is newer than last full release.
+	boost::optional<Semver> recent_version;
+	for (const std::string& ver_string : prerelease_versions) {
+		boost::optional<Semver> ver = Semver::parse(ver_string);
+		if (ver && *release_version < *ver && ((recent_version && *recent_version < *ver) || !recent_version)) {
+			recent_version = ver;
+			version = ver_string;
+		}
+	}
+	if (recent_version) {
+		BOOST_LOG_TRIVIAL(info) << format("Got %1% online version: `%2%`. Sending to GUI thread...", SLIC3R_APP_NAME, version);
+		wxCommandEvent* evt = new wxCommandEvent(EVT_SLIC3R_EXPERIMENTAL_VERSION_ONLINE);
+		evt->SetString(GUI::from_u8(version));
+		GUI::wxGetApp().QueueEvent(evt);
+	}
 }
 
 // Download vendor indices. Also download new bundles if an index indicates there's a new one available.
@@ -741,8 +750,8 @@ void PresetUpdater::sync(PresetBundle *preset_bundle)
 
 void PresetUpdater::slic3r_update_notify()
 {
-	if (! p->enabled_version_check) { return; }
-
+	if (! p->enabled_version_check)
+		return;
 	auto* app_config = GUI::wxGetApp().app_config;
 	const auto ver_online_str = app_config->get("version_online");
 	const auto ver_online = Semver::parse(ver_online_str);
@@ -754,7 +763,7 @@ void PresetUpdater::slic3r_update_notify()
 			GUI::MsgUpdateSlic3r notification(Slic3r::SEMVER, *ver_online);
 			notification.ShowModal();
 			if (notification.disable_version_check()) {
-				app_config->set("version_check", "0");
+				app_config->set("notify_release", "none");
 				p->enabled_version_check = false;
 			}
 		}
diff --git a/src/slic3r/Utils/PresetUpdater.hpp b/src/slic3r/Utils/PresetUpdater.hpp
index 085aaa4a6a..1313c3df83 100644
--- a/src/slic3r/Utils/PresetUpdater.hpp
+++ b/src/slic3r/Utils/PresetUpdater.hpp
@@ -63,7 +63,6 @@ private:
 };
 
 wxDECLARE_EVENT(EVT_SLIC3R_VERSION_ONLINE, wxCommandEvent);
-wxDECLARE_EVENT(EVT_SLIC3R_ALPHA_VERSION_ONLINE, wxCommandEvent);
-wxDECLARE_EVENT(EVT_SLIC3R_BETA_VERSION_ONLINE, wxCommandEvent);
+wxDECLARE_EVENT(EVT_SLIC3R_EXPERIMENTAL_VERSION_ONLINE, wxCommandEvent);
 }
 #endif