@Realjas When you try to launch the game, is Origin running? If so, close it, restart your computer (keep Origin closed), and launch TS3 through the icon in Applications.
If that doesn't help, or if you've already taken Origin out of the picture, you may need to edit the game's .sgr files. Luckily, someone has already written out instructions for your card. Please read them carefully and then make the appropriate edits to both graphicscards.sgr and graphicsrules.sgr.
https://bluebellflora.com/2018/07/24/sims-3-mac-players-i-need-your-help/#Filesready
And if this does work, please let us know. Bluebellflora still needs confirmation that the edits for your card are effective. If you still can't launch the game, please tell us as well; any feedback is always appreciated.
@Realjas You don't have to post on that page; I'll pass this thread on to Bluebellflora. (Maybe she'll have another idea for you as well.) In the meantime, there's one more thing you can try. Do another clean uninstall, create a new admin user account on your mac, and install into that account. Then patch the game, and if it doesn't run, apply the .sgr edits again.
A couple more questions: what OS were you running before Mojave? And do you have any antivirus software, or perhaps a program like Mackeeper that's supposed to clean or organize your files for you? These are notorious for messing with your system, and most of them aren't safe to run on macs at all.
I'll do what you mentioned and report back tomorrow afternoon.
I don't have any cleaning app or antivirus installed... Don't get any ideas! 😉 I ran the maintenance scripts through the terminal. I'm a web dev, so all this is not wholly unfamiliar to me. As for the OS, I believe I skipped High Sierra, so I guess I was on Sierra before?
@Realjas I've moved your post to the dedicated Sims/mac section. Hopefully your game is running now, but if not, and you'd still like help, please let us know.
