Thanks for the suggestions guys! I have everything pointing to C:\BB so no custom locations.

And I copied everything from my old D:/BB locations to their respective locations on the C drive.

Perhaps I am misunderstanding something basic...

Should I be seeing styles that do not contain RealTracks that I do not own? I don't recall that happening before, but perhaps I did not notice it. When I put the styles in date order there is not a single 2020 style that is complete - each one has at least one missing RealTrack instrument - can that be right?