I recently downloaded the Free Trial for the Archetype Petrucci, but It’s not showing up in S1 v6. I setted the File Location to Common Files/ VST3 and VSTPlugins. And I reseted the Blocklist. But all of those things don’t help.
Have you rescanned the VST folders? We are running S1 v5 and haven’t had any issues with plugins etc. Worst case, email email@example.com and they will get you sorted quickly.