Yes, this can all be done.
I believe the Installer will walk you through the options.
A minimal install puts the minimum needed on the C: drive.
Then you can copy the Realdrums and Realtracks (etc) to the other drive and point BiaB to that drive in Options-Preferences if you want to do it manually.
Same with RealBand


I do not work here, but the benefits are still awesome
Make your sound your own!