Wow I can't believe no one answered yet.
I am also a S1 v5 pro user who has been paying for upgrades since S1 V2.
Just today I purchased Sphere to take advantage of all it offers. I've had it for less than an hour and I'm hitting bugs.
I tried downloading a Mai Tai preset from the exchange but I am unable to download it. It says "Studio One Artist or Professional is required in order to use items from Exchange." Like wtf, I already have it installed.
any luck with your issue?