I don't know if you roll back if it would uninstall the other updates to RT/RD/Styles/Demos ?
You could just make a copy of the exe's and config files before updating
bbw64-728.exe
that's what I got, then I can run any version.
BB did keep previous exe's in Data\Backup but I don't see 2020 ?
If it could work that way with the previous settings also.
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ReaTrak Biab & Plugin in Reaper
Wasted (all BB).mp3