Sims 3 64 bit won't launch on macOS Big Sur

@tammytandy  Try editing options.ini to force the game to open in windowed mode.  The file is in Documents > Electronic Arts > The Sims 3; you can cmd-F to search for "fullscreen" and set it to 0.

If that doesn't help, please try playing while your computer is offline.  You can sign into Origin and put it in offline mode, then disable wifi before pressing Play.

@puzzlezaddict Thanks for the input!  I unfortunately wasn't able to locate a file with the keyword "fullscreen" in The Sims 3 folder.  Without being able to make the adjustment, I launched the game again in offline mode, and it still failed.. 

@tammytandy  The word "fullscreen" is in the file labeled options.ini, which in turn is in Documents > Electronic Arts > The Sims 3.  You have to open the options file to edit the settings.

Heya @puzzlezaddict, I tried this also, but still failed. I heard about the "clean uninstall" method, would you recommend, and would that delete all the past game records?

@tammytandy  I don't think you need to delete anything.  A factory reset means moving or renaming the Sims 3 folder in Documents > Electronic Arts, letting the game spawn a new folder, and not adding anything to it.  That's a useful and simple troubleshooting step you can try.

If you want to uninstall and reinstall the entire game, move the Sims 3 folder elsewhere, and your user content won't get deleted during the uninstall process,  That way you can go back to your saves if you want, that is if the game starts working again.

Hey TammyTandy, did you find a solution to your problem? I'm having the same problem right now, and im getting soo frustrated cause ive spent many hours tring to deal w it

@juunzie  What happens when you try to launch the game?  Have you ever installed or played Sims 3 on this computer before, and if so, was it the 64-bit version or the original 32-bit version?

Please also list the full specs of your Mac: everything under About This Mac except for the serial number.

@wilmahagstrom  Please list the full specs of your Mac: everything under About This Mac except for the serial number.  Please also list the packs you have installed and the world(s) you're playing in.