To get to MacOverrides, you have to go into the application bundle. From the finder, you can right click on the executable ("XCOM Enemy Unknown" or "XCOM Enemy Unknown.app" at the root level of your XCom directory under SteamApps/common) and hit "show package contents". It's just a regular directory, you don't need to recompile anything after you update the files. Doh. Got that. Only problem now I have is after moving all the files (and not patching the executable) I get a CTD. Can not figure out why. Spent 3 days on this. I guess I'll just wait for the install script, because I either get the LW button with vanilla options or a CTD. Neither one is working. I guess I'll reinstall vanilla, redownload and unpack the LW program and go from there.