This is crazy, I had the same thing just happen to me after quitting the software and shutting down my computer (troubleshooting a different issue). Went to open premiere and I got the same message. Went through all my auto saves same thing. Then it popped up saying I can start my trial??? What the heck, I’m paid up. Sign up now, then it signed me into my account. Everything opens fine now, now lets see if the restart helped the original issue. LOL