@kzych0905 While EA people have said they're still committed to the 64-bit update, there's been no news on the timing of its arrival. Given the current situation, I wouldn't expect it any time soon, although I would love to be surprised.
Unfortunately, there aren't any current options for playing in Catalina. You could partition your hard drive and install Windows on one side (known as Bootcamping), which is not overly complicated on new-ish Macs, I think almost any model from 2015 or later. You'd need to be able to set aside sufficient storage for Windows and Sims 3, plus all your content. Ideally, you'd have at least 200 GB for the Bootcamp partition, plus another 50 GB free on the Mac side. You could get away with a bit less for Windows if you were careful about your free storage.
Or you could install Mojave or earlier on an external drive. To install Mojave though, you'd need a hard drive or USB stick you don't mind erasing, and it should have a capacity of at least 128 GB, although you might want more if you use a lot of custom content. More relevantly, you'd need temporary access to a Mac that hasn't been updated to Catalina yet, so you could download the Mojave installer and run it. You could also install Sierra or High Sierra if that Mac is old enough to not support Mojave.
Either way, you would boot into the other OS when you wanted to play. The game would run much better than in Parallels or another VM, both because the drivers are better and because the system would only be running the one OS at a time.
If you have more questions about these options, please feel free to ask.
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I don't work for EA. I'm just trying to help fellow players with their games.
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