November 2020
Hi, I just installed sims 3 and around 9 expansion packs for it on my macbook pro, the new version 64 bit. when I try to launch it, a box just pops up saying "an unknown error occured" I have tried all the basic trouble shooting things. My mac is running version 10.15.6 Catalina, my mac is a 16 inch 2019 version, 2.4 ghz 8 core intel i9, memory 32 gb 2667 mhz ddr4. graphics amd radeon pro 5500m 8gb, intel uhd graphics 630 1536 mb.
November 2020
@Damos19 Some of us are playing with all expansions installed, so I doubt this has anything to do with your nine EPs. Does your game throw the unknown error when you press Play in Origin or in the Sims 3 launcher? Please move your entire Sims 3 folder out of Documents > Electronic Arts, that is if you have one, and try to play. If that doesn't work or you don't have that folder, please run the Origin reset tool for macOS:
https://help.ea.com/en-us/help/origin/origin/how-to-reset-origin-on-mac/
Restart your computer, open your Origin game library, right-click on the Sims 3 icon, and select Repair. Then try to play again.