I'm not completely clear on this problem either, but one possibility is that you had a lot of Xtra Styles and Bonus Paks and maybe Artist Paks installed on your 2020 version. Those are extras and would not be there now. You just have to find the installers and load them again. If you lost those files, too, then log on to your customer account (different from this forum account) and if you bought directly from PG Music, your past install files will be there.

I also ran out of space installing my extras over the new version. I just moved some files to another drive and proceeded. There was no reason that would 'corrupt' the drive. Of course, you are better off with a new drive, and it isn't a bad idea to start over by reinstalling Windows every few years anyway and get the cobwebs out.

BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.