I don't think my Mac is running Catalina - it currently says it is still Sierra (10.12.6) even though I thought I had fully updated the laptop a few days ago. But I just tried resetting and re-downloading Origin and it worked! My storage is back up to (nearly) what it was before I tried installing TS3. Thank you so much for helping. Hope you have a good day!
@belleessie That's great to hear. By the way, the minimum requirement for the 64-bit version of Sims 3 is High Sierra, although I don't know whether that means it won't run on Sierra at all or just won't run well. So if you're looking forward to the update, you may want to plan to install at least HS, if not Mojave. You can see the full list of minimum and recommended requirements here:
