diff --git a/src/slic3r/GUI/Downloader.cpp b/src/slic3r/GUI/Downloader.cpp
index 157233076d..ff66b85c58 100644
--- a/src/slic3r/GUI/Downloader.cpp
+++ b/src/slic3r/GUI/Downloader.cpp
@@ -177,6 +177,7 @@ void Downloader::on_error(wxCommandEvent& event)
     BOOST_LOG_TRIVIAL(error) << "Download error: " << event.GetString();
 	NotificationManager* ntf_mngr = wxGetApp().notification_manager();
 	ntf_mngr->set_download_URL_error(id, boost::nowide::narrow(event.GetString()));
+	show_error(nullptr, format_wxstr(L"%1%\n%2%", _L("The download has failed:"), event.GetString()));
 }
 void Downloader::on_complete(wxCommandEvent& event)
 {
diff --git a/src/slic3r/GUI/DownloaderFileGet.cpp b/src/slic3r/GUI/DownloaderFileGet.cpp
index 10142c7c12..deac45ad55 100644
--- a/src/slic3r/GUI/DownloaderFileGet.cpp
+++ b/src/slic3r/GUI/DownloaderFileGet.cpp
@@ -129,7 +129,7 @@ void FileGet::priv::get_perform()
 	if (m_written == 0)
 		file = fopen(temp_path_wstring.c_str(), "wb");
 	else 
-		file = fopen(temp_path_wstring.c_str(), "a");
+		file = fopen(temp_path_wstring.c_str(), "ab");
 
 	assert(file != NULL);