I am not sure if this applies to you I just bought both high end loft and ambitions yesterday installed both updated and game froze at loading screen especially after getting a non critical core mismatch error. Finally I uninstalled everything and tried all over again with a clean install got the same thing. I kept reading through posts not finding anything. Finally I tried something that worked instead of downloading from mirror 1, I tried downloading from mirror 3 and to my surprise no error message and game loaded fine now to go through and put all my custom content back in that ought to take a month or two

***note to J. M. Pescado****

Please check mirror 1 maybe for some reason it got a bad copy I've noticed many people are running into problems when they are saying they have tried everything else. Don't know if it's just me or not that had this exact same problem but worth a shot.