The Sims 3 64-bit & metal NOT WORKING

@luckypalmer  Just out of curiosity, please open Macintosh HD (or whatever you've named your hard disk) > Library > Application Support > Origin > DownloadCache, and if there are any files present, let me know what they are and how large they are.  (Or you could take a screenshot.)  This is where Origin stores downloaded games before installing, and I'm wondering whether the game files are there and in what form, and also whether you could manually launch the installer instead.  Probably not, but like I said, I'm curious.

If you don't see Macintosh HD listed in the left panel of a Finder window, click Finder in the upper left corner of your screen, select Preferences > Sidebar, and check the box next to hard disks.

If you can't install Sims 3 that way, please run the Origin reset tool, restart your computer, and try to download only the base game.  You can deal with the packs later, but they won't install if the base game isn't present.

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

Just to clarify by the way, the 64-bit version of Sims 3 does have a minimum requirement of High Sierra (OS X 10.13) or newer.  Since you're saying the 32-bit version is incompatible with your Mac, it sounds like you're running Catalina (10.15), but just in case, please double-check what OS you're running.  Click the Apple icon in the upper left corner of your screen and select About This Mac, and you'll see your OS listed along with the other specs of your Mac.

My mac is running on Sierra 10.12.6 ☹️ I think this is the problem. 

@luckypalmer  That is exactly the problem.  I'm not sure why you thought the 32-bit version of Sims 3 was incompatible with your Mac, because it still runs fine in Sierra, at least most of the time.  At any rate, you can definitely update to High Sierra, and if your Mac also supports Metal, you'll be able to install the 64-bit version.

Be sure to uninstall the 32-bit version first though.

Thank you for all your help. Sorry, I'm not very tech-savvy, The Sims 3 does not load onto my laptop though, there's always an error. Ok, so I've just checked if my mac supports metal and it does. So you're saying I should uninstall the 32-bit version and upgrade to high Sierra?

Thank you again for all your time!! 🙂 

@luckypalmer  Yes, if your Mac does in fact support Metal, go ahead and do a clean uninstall of the old version of Sims 3, upgrade to at least High Sierra, and you'll be able to install the 64-bit version of Sims 3.  Here's how to do a clean uninstall:

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

Here are the links for High Sierra and Mojave:

https://support.apple.com/en-us/HT208969

https://support.apple.com/en-us/HT210190

You don't need to install Catalina; either of the above would be fine.

I've updated to High Sierra and was then able to install the 64-bit and metal game as well as expansion packs, however, the launcher will not respond and I keep needing to force quit it.

@luckypalmer  Please post the full specs of your Mac, as described here:

https://answers.ea.com/t5/Technical-Issues-Mac/32-bit-Sims-3-Mac-Help-Guides-and-Troubleshooting/m-p/4756624#M2878

Here you go.

The game is working perfectly fine now thank you so much!! Hope this thread can help anyone with the same problem  🙂)