diff --git a/plugins/VersionUpgrade/VersionUpgrade44to45/VersionUpgrade44to45.py b/plugins/VersionUpgrade/VersionUpgrade44to45/VersionUpgrade44to45.py
new file mode 100644
index 0000000000..36ee2bac16
--- /dev/null
+++ b/plugins/VersionUpgrade/VersionUpgrade44to45/VersionUpgrade44to45.py
@@ -0,0 +1,69 @@
+import configparser
+from typing import Tuple, List
+import io
+from UM.VersionUpgrade import VersionUpgrade
+
+# Merged preferences: machine_head_polygon and machine_head_with_fans_polygon -> machine_head_with_fans_polygon
+# When both are present, machine_head_polygon will be removed
+# When only one of the two is present, it's value will be used
+
+
+class VersionUpgrade44to45(VersionUpgrade):
+    def getCfgVersion(self, serialised: str) -> int:
+        parser = configparser.ConfigParser(interpolation = None)
+        parser.read_string(serialised)
+        format_version = int(parser.get("general", "version"))  # Explicitly give an exception when this fails. That means that the file format is not recognised.
+        setting_version = int(parser.get("metadata", "setting_version", fallback = "0"))
+        return format_version * 1000000 + setting_version
+
+    ##  Upgrades Preferences to have the new version number.
+    #
+    #   This renames the renamed settings in the list of visible settings.
+    def upgradePreferences(self, serialized: str, filename: str) -> Tuple[List[str], List[str]]:
+        parser = configparser.ConfigParser(interpolation = None)
+        parser.read_string(serialized)
+
+        # Update version number.
+        parser["metadata"]["setting_version"] = "11"
+
+        result = io.StringIO()
+        parser.write(result)
+        return [filename], [result.getvalue()]
+
+    ##  Upgrades instance containers to have the new version
+    #   number.
+    #
+    #   This renames the renamed settings in the containers.
+    def upgradeInstanceContainer(self, serialized: str, filename: str) -> Tuple[List[str], List[str]]:
+        parser = configparser.ConfigParser(interpolation = None)
+        parser.read_string(serialized)
+
+        # Update version number.
+        parser["metadata"]["setting_version"] = "11"
+
+        if "values" in parser:
+            # merge machine_head_with_fans_polygon (preferred) and machine_head_polygon
+            if "machine_head_with_fans_polygon" in parser["values"]:
+                if "machine_head_polygon" in parser["values"]:
+                    del parser["values"]["machine_head_polygon"]
+            elif "machine_head_polygon" in parser["values"]:
+                parser["values"]["machine_head_with_fans_polygon"] = parser["values"]["machine_head_polygon"]
+                del parser["values"]["machine_head_polygon"]
+
+        result = io.StringIO()
+        parser.write(result)
+        return [filename], [result.getvalue()]
+
+    ##  Upgrades stacks to have the new version number.
+    def upgradeStack(self, serialized: str, filename: str) -> Tuple[List[str], List[str]]:
+        parser = configparser.ConfigParser(interpolation = None)
+        parser.read_string(serialized)
+
+        # Update version number.
+        if "metadata" not in parser:
+            parser["metadata"] = {}
+        parser["metadata"]["setting_version"] = "11"
+
+        result = io.StringIO()
+        parser.write(result)
+        return [filename], [result.getvalue()]
diff --git a/plugins/VersionUpgrade/VersionUpgrade44to45/__init__.py b/plugins/VersionUpgrade/VersionUpgrade44to45/__init__.py
new file mode 100644
index 0000000000..06a9d66c50
--- /dev/null
+++ b/plugins/VersionUpgrade/VersionUpgrade44to45/__init__.py
@@ -0,0 +1,61 @@
+# Copyright (c) 2019 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+from typing import Any, Dict, TYPE_CHECKING
+
+from . import VersionUpgrade44to45
+
+
+if TYPE_CHECKING:
+    from UM.Application import Application
+
+upgrade = VersionUpgrade44to45.VersionUpgrade44to45()
+
+
+def getMetaData() -> Dict[str, Any]:
+    return {
+        "version_upgrade": {
+            # From                           To                              Upgrade function
+            ("preferences", 6000010): ("preferences", 6000011, upgrade.upgradePreferences),
+            ("machine_stack", 4000010): ("machine_stack", 4000011, upgrade.upgradeStack),
+            ("extruder_train", 4000010): ("extruder_train", 4000011, upgrade.upgradeStack),
+            ("definition_changes", 4000010): ("definition_changes", 4000011, upgrade.upgradeInstanceContainer),
+            ("quality_changes", 4000010): ("quality_changes", 4000011, upgrade.upgradeInstanceContainer),
+            ("quality", 4000010): ("quality", 4000011, upgrade.upgradeInstanceContainer),
+            ("user", 4000010): ("user", 4000011, upgrade.upgradeInstanceContainer),
+        },
+        "sources": {
+            "preferences": {
+                "get_version": upgrade.getCfgVersion,
+                "location": {"."}
+            },
+            "machine_stack": {
+                "get_version": upgrade.getCfgVersion,
+                "location": {"./machine_instances"}
+            },
+            "extruder_train": {
+                "get_version": upgrade.getCfgVersion,
+                "location": {"./extruders"}
+            },
+            "definition_changes": {
+                "get_version": upgrade.getCfgVersion,
+                "location": {"./definition_changes"}
+            },
+            "quality_changes": {
+                "get_version": upgrade.getCfgVersion,
+                "location": {"./quality_changes"}
+            },
+            "quality": {
+                "get_version": upgrade.getCfgVersion,
+                "location": {"./quality"}
+            },
+            "user": {
+                "get_version": upgrade.getCfgVersion,
+                "location": {"./user"}
+            }
+        }
+    }
+
+
+def register(app: "Application") -> Dict[str, Any]:
+    return {"version_upgrade": upgrade}
diff --git a/plugins/VersionUpgrade/VersionUpgrade44to45/plugin.json b/plugins/VersionUpgrade/VersionUpgrade44to45/plugin.json
new file mode 100644
index 0000000000..f7b6157118
--- /dev/null
+++ b/plugins/VersionUpgrade/VersionUpgrade44to45/plugin.json
@@ -0,0 +1,8 @@
+{
+    "name": "Version Upgrade 4.4 to 4.5",
+    "author": "Ultimaker B.V.",
+    "version": "1.0.0",
+    "description": "Upgrades configurations from Cura 4.4 to Cura 4.5.",
+    "api": "7.0",
+    "i18n-catalog": "cura"
+}
diff --git a/plugins/VersionUpgrade/VersionUpgrade44to45/tests/TestVersionUpgrade44To45.py b/plugins/VersionUpgrade/VersionUpgrade44to45/tests/TestVersionUpgrade44To45.py
new file mode 100644
index 0000000000..60b5494f84
--- /dev/null
+++ b/plugins/VersionUpgrade/VersionUpgrade44to45/tests/TestVersionUpgrade44To45.py
@@ -0,0 +1,42 @@
+import configparser
+
+import VersionUpgrade44to45
+import pytest
+
+before_update = """[general]
+version = 4
+name = Creality CR-10S_settings
+definition = creality_cr10s
+
+[metadata]
+type = definition_changes
+setting_version = 10
+
+[values]
+%s
+"""
+before_after_list = [
+        ("machine_head_with_fans_polygon = [[-99, 99], [-99, -44], [45, 99], [45, -44]]", "[[-99, 99], [-99, -44], [45, 99], [45, -44]]"),
+        ("", None),
+        ("machine_head_polygon = [[-98, 99], [-99, -44], [45, 99], [45, -44]]", "[[-98, 99], [-99, -44], [45, 99], [45, -44]]"),
+        ("machine_head_polygon = [[-87, 99], [-99, -44], [45, 99], [45, -44]]\nmachine_head_with_fans_polygon = [[-99, 99], [-99, -44], [45, 99], [45, -44]]", "[[-99, 99], [-99, -44], [45, 99], [45, -44]]"),
+    ]
+
+
+class TestVersionUpgrade44to45:
+
+    @pytest.mark.parametrize("after_string, after_value", before_after_list)
+    def test_upgrade(self, after_string, after_value):
+        upgrader = VersionUpgrade44to45.VersionUpgrade44to45()
+
+
+        file_name, new_data =  upgrader.upgradeInstanceContainer(before_update % after_string, "whatever")
+        parser = configparser.ConfigParser(interpolation=None)
+        parser.read_string(new_data[0])
+
+        if after_value is None:
+            assert "machine_head_with_fans_polygon" not in parser["values"]
+        else:
+            assert parser["values"]["machine_head_with_fans_polygon"] == after_value
+
+        assert "machine_head_polygon" not in parser["values"]
\ No newline at end of file