Okay, I've unzipped the file, and placed the new dat files in their correct folders.
I removed all the solo strings in Directory Manager, then added them back and even re-scanned just to be sure.
Here's what I find:
In the Matrix list for solo violin, there seem to be more matrices than before. However, only 2 of them will load. For most of them I get an error message like [Error laoding matrix VI 01_basic].
Most of the viola matrices do load but there are 2 that give the same message.
For cello, only the first one won't load (VC 01_basic)
Same with bass - the first one won't load (DB 01_basic)
As a result, I can't test further for the problems I reported before.
I randomly checked some older Solo Strings matrices and it seems I have missing patches everywhere.
For example, in 05 VI Short+Long notes-All, over half the cells are red, showing missing patches.
Should I re-install all of the solo strings?
(My apologies for hijacking this topic with my problems)