User blog comment:Duskey/Ingame advertising, where will it end?/@comment-1519608-20100621235451

@LanieObsessed - It's included in Patch 12 (the most recent, released May 28, 2010) and it must be downloaded before Ambitions can be installed.

What's your version number (can be found on the Sims 3 launcher screen, in the lower left corner)? I can tell you if you have the patch or not.