Re: sims crashing on startup on mac
@rstewy143 Make sure iCloud drive isn't set to automatically sync your Documents folder. Here's how:
https://bluebellflora.com/2017/02/06/sims-3-and-sims-4-not-loading-save-games/
And turn off the Origin web helper service. In Origin, hover over your username, select Application Settings, and under Application (the first header), scroll down to Start-up options.
Please also disable Origin in-game both globally and for Sims 4. The global setting is under Application Settings > Origin in-game. To see the Sims 4 setting, right-click on the TS4 icon in your Origin game library and select Game Properties.
If these steps don't help, please post the full specs of your Mac, as described here: