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

yep, i play on my ancient mac that does not do updates any more.  in fact all it does is play cod 

thank god for that old mac twist!. 
think things getting worse between google and apple. until last year all indicated that they were trying to work together. but now seems one has to decide with which one to marry to. kids school is now "google approved" now seeing what that meant.
I am half way, android phone, IOS computer...but don't think will be able to handle it much longer.

Cappy