I upgraded from Studio One 4 Pro to 5 Pro. Most of it seemed to install ok, but "Studio One Piano.soundset", "Synth Session.soundset", and "Voodoo One Synth.soundset" all say they failed in the Transfers dialog. I bought the upgrade on the day it was announced I think, and a few additional installable items failed to download. However, they were successful over the next couple of days. These remaining three still won't download or install for some reason.
I'm on a Macbook Pro 2019 16", OS X 10.15.5.