wrote: There's a SimCity Complete Edition on AppStore in Catelina version.
Does that work?
I don't know for sure if it has been converted to 64-bit or not. The newest information I have seen is in this post, updated on Oct 9 : https://support.aspyr.com/hc/en-us/articles/360000214186-MacOS-Catalina-64-bit-32-bit-and-related-Questions where it says that SimCity is a "planned update" to 64-bit.
Your best bet is to ask Aspyr if SimCity has been updated to 64-bit.