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QT6 is the cross platform base upon which Calibre 7 is built.
I have a Lenovo running windows 10 and Calibre 6.29 which seems pretty robust. I’ve had problems with my graphics drivers not installing properly but as calibre 6 runs on QT5 I haven’t run into problems with my ebooks.
If you want to play with different versions of calibre I would suggest copying your library and then use a version of calibre portable on your copy of the library.
As the database control changes between versions, you are advised to use copies of your library whilst giving it a go.
I think though that your problem may with the update to windows 11 as you suggest.
Sorry I can’t help you more.
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