The ST 3.5 setup would never complete - always hanging at 100%. I could not find any hidden dialog boxes behind it. Finally, I killed the process and opened ST and fortunately it did seem to complete the install. Everything seemed to be fine, so I installed the sounds update. Again I opened ST and it ran through the library update and all seems to be fine.
Two issues I see at this time:
1. The only icon I get is for SampleTank 3 itself - the top node in the library that you expand to actually get to the sounds. There are no other icons in the library.
2. If I select MULTI (it defaults on INSTRUMENT) the only node I get in MULTI is Demo. Maybe this is the way it's supposed to be?
3. Keyboard navigation improvements are nice, but I wish there was a way to get to and copy the patch name. I would like to build a script to create Ableton racks for all of these instruments, and that would help a lot.
I installed the new Custom Shop and it appears to be working just fine.
YMMV