Heya Please use the AHQ link above for this topic. This forum is not for the discussion or troubleshooting of game issues as we do not have the dedicated staff to assist here with those issues that we do on AHQ.
Gotcha, the Legacy version of Sims 4 has been retired (announced back in November). You'll need to have a Mac running 10.11 (El Capitan) or newer that supports the Metal API to continue playing The Sims 4. It looks like based on the specs you shared you have either a 2011 model iMac or MacBook Pro, both can update to El…
Hmm, were you playing the Legacy version of The Sims 4 by chance? Can you click the Apple icon in the upper-left corner of the screen and select About This Mac. Please post everything you see there including the operating system except for the serial number.