Well I finally achieved success! smile

Interestingly the help came from a PGMusic chat agent.

It had been recommended to me from most to choose the 4th install option (Custom Install)
but that didn't do the trick.
I had to choose the 2nd Install option.

And do unintuitive things like agree to a full installation at the start!
Shortly after I got to screens where I could tell BIAB to install to d:\bb
and not install any RealTracks or RealDrums.

So I can now start BIAB 2024. I have re-built the RealTracks/Drums list.
I haven't tried to play any songs or input chords etc. or do anything yet with BIAB, but
at least it is finally working!

And it is working from my 'hard drive', which is where I wanted it to run from.
And it doesn't require any USB disk to run! smile

And the disk space required was:
d: 28.4G
c: 1.4G
So that was cool too. smile

Thanks to all here for sticking with me through this!

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