When the 14 days elapse, you will be switched to the free version. That's what I use. Just remember to manually do the scans regularly since the free version doesn't do it automatically. Just agree to the free version when asked. They will remind you that the paid version is always available to buy.
I hope you didn't pay the scammers anything or you would have been marked as a target. That red screen pops up a lot now and to get out of it all you have to do it open Task Manager and stop the frozen browser application. Make sure to clean out your browser history to remove any leftovers. Never call anyone from a popup on the computer.
I found help about removing that scam program and all the parts of it--
https://forums.malwarebytes.com/topic/190733-removal-instructions-for-my-faster-pc/