I have W 11 on the laptop I am using now and I hate it. Very intrusive. I have spent a great deal of time disabling things that were downright in violation of my privacy. I di check some of the links you recommended a while ago. I am suspicious of W 10 installation software that seems too low priced. Eventually I gave up looking. In any event the same thing is soon to happen to v.10 as happened to v.7 Maybe I'll do a bit more looking at W 10.
I still would like to hear from anyone having moved FSX Gold (or any non-Steam version) to Windows 11.