Thanks for the response Andrew.

I located the RBass156, RBass157, RBass158. ST2 and Xt2 files in BIAB 2017,
copied & pasted into the Soloists folder of 2018.
Re-installed RT sets 14,55,57, checked in folders that everything is where it should be, then rebooted.

Nine RTs still N/A

After rebuild I get the following;

9 RealTracks have r*.st2 flies in the BB folder, but no RealTracks in the
folder D:\bb\RealTracks. ither install RealTracks again, or point to correct
RealTracks folder in RT settings. then press REBUILD button to rebuild the list.

The following are the only Acoustic Bass folders with today's date and I reckon those I have marked* are the RTs in question.

*Bass, Acoustic, Jazz BeBop Sw 190
Bass, Acoustic, Jazz Modern Sw 140
*Bass, Acoustic, Jazz Sw 110
*Bass, Acoustic, Jazz Sw 140
Bass, Acoustic, Soloist Jazz Sw 140
Bass, Acoustic, PopWaltz Ev 085

What do I do now?

Vintage