sims 3 won't launch and i cannot uninstall

@samonie33  I've moved your post to the Sims 3 Mac section.  Please start by using these instructions to do a clean uninstall; they work even if the game's own uninstaller doesn't.

https://bluebellflora.com/how-to-do-a-clean-uninstall-and-reinstall-on-a-mac/

Running the Origin reset tool should take care of the "finalizing" message, now and if you run into it later.

https://help.ea.com/en-us/help/origin/origin/how-to-reset-origin-on-mac/

Restart your computer, and install the base game only, no packs.  Run the Super Patch (digital download version) to manually patch the game to 1.67.  The launcher doesn't always do an efficient job of patching on its own.

https://bluebellflora.com/sims-3-manual-super-patch-for-mac-1-67/

Launch the game, and let me know whether it works.  If you get the server error, you can ignore it for now—it will go away if you install almost any pack.  If you need instructions on how to install your packs, please list the ones you own, and I'll write them out.

Hello, thank you for the help. I took all steps listed, and all was going smooth for the uninstallation. I uninstalled completely with your steps, but when I reinstalled and tried clicking play, the "unknown error occurred" message still popped up. I tried downloading the 1.67 patch like you said, but when I got to the step where you choose which application to patch, the sims 3 folder was nowhere to be seen. I don't know if this has anything to do with it, but when I open my finder and go to electronic arts> sims 3 , the sims 3 folder is completely empty, even after uninstallation and reinstallation. But as I was saying, everything worked in terms of uninstallation and reinstallation, but the error was still popping up. Once I seen this, I thought maybe installing the patch would fix it, like you said, but I think the issue is that the sims 3 folder is completely empty. Theres nothing in it at all. Please Help, thank you.

@samonie33  There are two Applications folders on your Mac, the main one and the user's one.  Please check both for a Sims 3 folder, and let me know what you see inside that folder.  To access the user folder, open a Finder window, click Macintosh HD (or whatever you've renamed your hard disk) in the left panel, then users > your username > Applications.  If you don't see your hard disk listed, click Finder in the upper left corner of your screen, then Preferences > Sidebar, and check the box next to hard disks.

Right after posting my last comment, I finally found the sims 3 folder. I clicked it and downloaded the patch, and still no fix. The "unknown error" still pops up. From here, I can't even think of another solution ☹️. Sims 3 has been uninstalled and installed on my computer already, and I refrained from downloading any expansions, because after downloading late night is when the error first began to pop up. I successfully deleted late night after and the pop up was still happening. After I uninstalled both late night and the game, and redownloaded only the base game, the pop up is still happening. At this point, I have no idea what I could do to fix it. Any ideas?

@samonie33  You may need to add your graphics card to the games database.  If you like, I can help with that—please post the full specs of your Mac, as well as the device ID of your graphics card, as described here:

https://bluebellflora.com/2018/07/24/sims-3-mac-players-i-need-your-help/#Information

Or, if you see your card listed further down on that page, you can download the prepared text and add it to your .sgr files.

@samonie33  What file is blank?  And I specifically need the device ID of your graphics card, the second part of the info here:

https://answers.ea.com/t5/Technical-Issues-Mac/the-sims-3-64-bit-amp-metal-release/m-p/8631090#M6105

Please also list your exact version of macOS.