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Re: The Sims 3 64 Bit not Launching

@Gegahex  Bluebellflora's guide to a clean uninstall isn't outdated; it's for the 32-bit version of Sims 3.

Anyway, please uninstall the game through Origin (right-click, Uninstall), then do a clean uninstall of Origin itself:

https://bluebellflora.com/how-to-uninstall-origin-on-a-mac/

Create a a new admin user account on your Mac, and don't import any settings or sync with any of your existing accounts, including iCloud.  Download a fresh copy of Origin in that user account, install Sims 3, and see whether you can play.  If not, please let me know whether you're using a third-party antivirus or a cleaner app.

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