Originally Posted By: VideoTrack
I think it will work if you install in two different folders, e.g. install 2020 in a folder named: '\bb_2020\' and install 2021 in the normal '\bb\' folder.

Then in the \bb_2020\ version set the RealTracks and RealDrums to share the folders from the 2021 version. This is done from Options > Preferences > RealDrums > Custom Drums Folder.
Do the same for RealTracks.

I believe that you are correct in your assumption that the 2021 styles and RTs will not work with the 2020.

Thanks, that seemed to work OK. My workflow was…..

Left 2021 in C/bb
Installed just my 2020 Pluspack exe file in C/bb2020 without any RT’s or style paks that came with my 2020 purchase.
Installed the last 2020 upgrade.
Created a BIAB 2020 icon on the desktop.
Set the 2020 preferences to point to the 2021 RD and RT folders
Copied the whole Styles folder from C/bb to C/bb2020
All my styles are found when running 2020 but not the 2021 RTs even though they are in the same folder that 2020 is pointed to.

Tony