If you want, I have two test builds for the latest Sigil (with Qt6.9.2) avialable here:
https://github.com/dougmassay/win-qt...s/tag/v5.212-1
They're the usual Sigil installers. "Test" was built locally by me with an older version of Visual Studio, and "Test2" was built with the latest Visual Studio by the Github CI process.
See if you have any trouble running either of those. You have a newer redist installed, so that shouldn't be a factor for either one.