Just Installed W10 Rev. 21H1 on my MS Surface Pro laptop with no issues.
1) Existing 2016 to 2020 TTX Premier versions all operational and files all intact.
2) 2020 TTX (Premier) already had the latest version installed, so it wasn't an issue for that software update
3) the only other thing I can think of as long as the main TTX software starts up, but just for missing files ), is that some people have reported that issue in the past too....BUT either..3a) they were storing their files on MS's cloud drive (OneDrive) and they had to log back into their MS cloud account first to reconnect with the files. or 3b) their files were in an external usb-connected drive whose system address had changed.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
