As a first step check Options > Preferences > RealDrums and see what you have for your customs drums folder, then do the same for Options > Preferences > RealTracks. Do they point to where your RealDrums and RealTracks are and is the checkbox ticked for each?

Secondly, run the Cleanup Routine from the Help > Utilities menu.

Probably the RealTracks and RealDrums are still on the D: drive and BiaB update now on the C: drive cannot locate them unless you set the paths.


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