You should clarify what you are looking a comment on, given this thread is quite lenghty.
What is the correct setting and in which place?
Also, just in case, you can do Start → Run → rundll32.exe sysdm.cpl,EditEnvironmentVariables.
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It works fine with Windows 11 as well. Otherwise I would have been surprised, the basis is Windows 10/8. The error was that I first had an installation with “STNOUPGRADE” = 1 and did not reinstall the MSI before using the MSI with “STNOUPGRADE” = 0.
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