Hello,
Sorry to hear you are having issues. Please refer to this guide: https://support.stardock.com/space/SHC/1260552209/Error:+212+or+Product+Keeps+Prompting+to+Activate.
Also, try to look into your system cleaner application. It is known that sometimes these system cleaner keep deleting license signature file. Which when that is done, the product think it was never activated. If you do have setup your system cleaner to run on set time period. Please whitelist this folder C:\ProgramData\Stardock.
Thank you,
Basj,
Stardock Community Assistant.