If using the Create-A-World is crucial to you, then by all means avoid updating to the latest patch (1.17/2.12/3.8/4.5/5.2) or installing The Sims 3 Late Night.  Word is coming in that CAW does not work, giving the same errors as users got when they installed The Sims 3 Ambitions.  There is no telling when The Sims Team will update CAW or even issue a patch for it, so the best bet is to hold off until then.

Via Sims 3 Nieuws