The RT's are on a set of DVD's and not on the PG program disk as they take up a lot of space.
Do you have a RT folder if you do then this notice in in the info file
"This folder is used to store the RealTracks audio files.

If this folder is empty, either you haven't installed any RealTracks, or you are using a RealTracks folder location outside of the bb folder (i.e. different from the default RealTracks folder location).

If you are using a different location for your RealTracks files, you need to specify it in the RealTracks Settings dialog in Band-in-a-Box.
Hope this helps Wyndham