@Youngduckho It looks like the
Sims 3 Starter Pack being sold on Origin comes with the Late Night EP and High-End Loft Stuff SP. Is this what you bought? Late Night is one of the packs known to cause an Unknown Error message. If you've downloaded it as well as the base game, the icon to launch it might not show up in your applications folder;
this is the workaround to fix it, should you get that far. The other workaround (the one in the video embedded where you posted at answers.ea) would probably not be necessary, as Late Night is the newer pack, and therefore its files wouldn't have to be copied to any other destination.
If this is the first time you've tried to download TS3, then your issue obviously wouldn't be due to a previous incomplete uninstall. I honestly couldn't tell you anything about the .sgr files and whether they've been edited properly (or if they needed to be at all), which is why I tagged igazor in my previous post. Just because the game doesn't recognize a graphics card doesn't mean that an edit is necessary. My laptop just spits out a message at the main menu screen that the game doesn't like my card and then allows me to play.
I really hope that this can work for you. Even with your integrated card, you might well be able to run the base game plus LN and HELS, although perhaps on lower graphics settings. You wouldn't be the first to succeed on your particular computer. But again, High Sierra is causing more problems than its predecessors, and I'm not sure anyone has figured out how to address that.
One thing you should know, if you don't already, is that even the best macs can't run TS3 the way it was meant to be played. EA never made a version for macs and instead used a program called Cider to wrap around the PC version and translate it for mac OS. And Cider can only use 2 GB RAM at a time as opposed to the ~3.5 GB available on the Windows side. This is the biggest reason why I just Bootcamped my laptop; there was no way for me to play with the most demanding EPs otherwise. There are some techniques to try to stay under the RAM limit, but ultimately there's no way around the fact that TS3 for mac is just not going to perform at the same level as it would on Windows.
