The update checker failing is due to a problem on our side, which we've just fixed. If you re-download the 12.13 installer from here, it should work again: Directory Opus 12.13
Re-running the installer should usually fix the other problem you're seeing, which is usually due to the program files being modified/corrupted in some way.
If you still get that problem after using the new installer and rebooting, please let us know.
Please don't post your licence details in public. We may need to block that licence code now and issue you with a new one. (That's handled by other people but, for now, I've removed them from the post.)