@t0nai You're right, the German isn't an issue; all the important information is easy to find regardless.
You do in fact have an Intel 5200, even if it's not listed that way. I checked Bluebellflora's files, just to be sure, and the device ID she lists matches yours, so it should work fine. You can download the text to add to your files here:
https://bluebellflora.com/2018/07/24/sims-3-mac-players-i-need-your-help/#Filesconfirmed
Be sure to test in the alternate user account, since that's the one that's being more cooperative, relatively speaking. An unknown error is better than no response at all.
I changed my .sgr files, but I still don't get the game to work. On the alternate user I get thte "Unknown error" message, and on my main user nothing happens.
@t0nai Can you post screenshots of the edits you did? Sometimes TextEdit messes with the formatting.
And I'd also like to see part of your deviceconfig, if you have one—just the entry between Graphics Device Info and Options, so from about 25 to 40 lines down.
This is what my edits look like. I'm not quite sure where to find the deviceconfig. (I still don't have the The Sims 3 game file, because I could never launch the game after reinstalling)
