I've just tried to install YEM 2.5.3 on my Mac, Chris and found it doesn't even install, let alone run. For that reason, I've removed the file from my OneDrive to save anyone the trouble.
Actually, because of the Mac Big Sur OS issue, I'm running the Windows version of YEM 2.7.0 on my virtual PC within my Mac. Bit annoying because I basically had to rebuild everything from scratch. Also, the YEM interface on my virtual PC isn't very good (I've no idea why), but the main thing is, it works.
Tecknoss' X2 by the way means 'me too' ...
Cheers
Chris