New Mac´s with M1 processors (my case) will not:
a) let you Downgrade to Mojave (last OS with 32 bit ie COD4)
b) let you partition disk via Boot Camp (windows partition) and launch COD4 from steam
So if old one fails. I can not see a way to run COD4 for new Macs other than having a gaming laptop (windows base) apart from working one.
Other issues, Adobe only will run on their cloud. so another 65 bucks to cough up. app cleaner does not work either, still checking other apps.
Cappy