Still Crash/Freeze in CAS. Sims 3.

Hi everybody, 

After many many many tries and hours used on the installation of the Sims 3, many different ways explored, the game still crashing or freezing in CAS, most time when I go to the clothes. 
I installed all the expansions, following all the instructions point by point, so it's not the problem. 

(I'm on a 21,5 iMac end 2013, with  2,7GHz). 

I need your heeeeelp !