C&C Ultimate Collection - Won't load

So, i've recently booted up my old PC to play the C&C series again.

As we all know, EA has forced us to update Origin to the EA App... in the process, I have lost access to the games. a pop up keeps coming up saying
"This title may have been downloaded to your device by another user who owns the game. Log into a different account or restart the App"

I have tried multiple accounts, restarted the app, uninstalled and reinstalled. 

The games don't come up in my game library, but there are saved to my desk top.

I am reluctant to delete the games as i spent £60.00 on the ultimate collect. 

Any one got any solutions? Th CNCNZ forum requires me to go into the Origin app to sort them, but that no longer exists... 

Please help!!