F-Secure did not inform me that I wasn't protected...

Jodb

I have a 2012 Mac Pro that seems unable to update beyond the Catalina (OS 10.15.7). My subscription renewal was due on 4/12/2024, so as usual I renewed early to protect myself and the other two family licensees. Their newer computers automatically updated, but mine continued to show the 'Subscription Expired' details (red spot on FS icon, request to renew, etc). I contacted FS Chat for assistance on 5/12/2024 and learned that Catalina not supported, and that I had to upgrade system to OS12+ or else FS won't work. My last automatic 'update' in late November suggested everything was working. My computer will not handle (or even offer me) any upgrade as it stands. It seems I've been paying for non existent protection for the past few years on my computer, though this was never brought to my attention. Any recommendations on how best to proceed from here without having to buy another new computer…Thank you.