Re: How do I COMPLETELY uninstall TS3 64-bit
@ayyysims3 Uninstalling Sims 3 from Origin and running the Origin reset tool should get rid of all the relevant files.
https://help.ea.com/en-us/help/origin/origin/how-to-reset-origin-on-mac/
The only folder that might remain is the Sims 3 folder in Documents > Electronic Arts, but that's just user data: saves, store and custom content, mods, etc. You could move it elsewhere or just trash it if you don't want to save any of the files inside.
If you've tried uninstalling Origin and are still seeing Sims 3 files, please let me know where they are. For any file you find, you can right-click and select Get Info; the file path will be listed under "Where."