Well, I just "dragged & dropped" a copy oy 2015 from an older USB HDD into the 2016 Realband folder.
Just overwrote the files that were in there.
Ran 2015 (not sure what update - probably didn't matter)
2015 worked fine with the Style Picker.
Then re-installed 2016 into same folder over 2015.
Everything worked fine.

BTW. Dragging 2016 from the USB Drive into the problematic 2016 folder did not have the same effect as doing the same with 2015.


iMac, 3.7 GHz 6-Core Intel Core i5, BIAB MAC2024 (802), Audient iD4