OK this is the reason I made my initial post.
I am ready to do a minimal installation.

I clicked on setup.exe.

The first screen had a drop down list with three choices:
Normal Installation
Custom Installation
Full Installation

Custom Installation seems like the logical choice for me right?

There are five (5) checkboxes available with Custom Installation:
1. BIAB + Realband, DAW plugins, RealTrack files, Real Drums, Super Tracks, Artist Perf., other BIAB addons.
2. Hi-Q inst. for Sforzando
3. Playable Realtracks Set 1 for Sforzando
4. Playable Realtracks Set 2 for Sforzando
5. Playable Realtracks Set 3 for Sforzando

So right away it's not looking good. I didn't go beyond this screen.
For 1. I don't want all the RealTrack and Real Drums files installed and I don't know what the other files are for?
For 2. I don't know what it is talking about.
For 3. I don't know if I need/want any of these files?
For 4. I don't know if I need/want any of these files?
For 5. I don't know if I need/want any of these files?

A BIAB user for more than 30 years (if you can believe it) !