Click on the RealTracks icon > Prefs
Click on the RealDrums icon > Prefs

You should have a similar installer as the Win one below, select the 2nd option.

Attached Files (Click to download or enlarge) (Only available when you are logged in)
Mac_RT-Location.png (164.72 KB, 107 downloads)
Mac_Drums-Location.png (141.46 KB, 107 downloads)
Biab-Setup.png (25.29 KB, 107 downloads)