@simsmnga146 I've moved your post to the Sims 3 Mac section.
Do you have any store or custom content already installed in your game? If so, you may have multiple game folders, and you're looking at the one that TS3 isn't using. A common spot for a second folder to appear is your iCloud drive. If you do see a folder there, drag it to your desktop for safekeeping, and check DCCache and Saves to see whether any of your content landed there.
The way TS3 works, your its game folder needs to be in the Documents folder on your hard drive, not in cloud storage. To keep things from getting confusing, and to make sure your game folder stays where it should, it's best to either disable iCloud storage entirely (you can turn it on when you want to transfer files), or at the very least, disable automatic uploads. Here are instructions, along with screenshots:
https://bluebellflora.com/2017/02/06/sims-3-and-sims-4-not-loading-save-games/
For the downloading issue, the store can be finicky on a Mac. There are a few steps you can try to get the downloads working:
If these steps don't help, drag your TS3 game folder out of Documents\Electronic Arts and onto your desktop (or somewhere else, if you already have a backup folder on your desktop), open the launcher to spawn a new folder, and try again. Once you've downloaded and installed the content into the new folder, you can copy the Saves and Library folders from your old game folder to your new one, as well as anything else you'd like to keep.
And please feel free to ask for more clarification on any of these steps.
