iMac (Retina 5K, 27-inch, 2017)
Processor : 4.2 GHZ i7
32 GB 2400 MHz DDR4
Radeon Pro 580 8192 MB
Mac OS Sierra
Sims 3 base game downloaded from Origin and by disc
When starting from terminal or by the app it says an unknown error has occurred.
Have you installed the game from Origin or by disc? It's not possible to have two installations.
If you're running Sierra don't bother with the disc version as it will not work. You need to download and install the base game through Origin. After downloading run the manual super patch (link in my signature below) for the digital version of the game and it should fix the error. BUT, before you do any of that make sure you thoroughly uninstall every single Sims 3 related file. Full instructions here on how to properly uninstall the game, including the hidden Library files.
