This changes the REINSTALLMODE [1] from the default omus to amus. this isn't recommended [2] but CMAKE [3] has been doing it for 6 years now without issues, so it will probably be fine? [1] https://learn.microsoft.com/en-us/windows/win32/msi/reinstallmode [2] https://stackoverflow.com/a/71225056/1938798 [3] https://github.com/Kitware/CMake/blame/master/Utilities/Release/WiX/WIX.template.in#L28 Pull Request: https://projects.blender.org/blender/blender/pulls/137668