I have read through this post and seem to be having the same problem as the original poster indicated, with only one minor difference.  I have the base game and all of the expansions and stuff packs, store bought, disc in hand and updated via the Mod the Sims updater.  For reasons unknown to me, AM is not functioning correctly, and has not functioned correctly since the release of Outdoor Living Stuff and its update.  I am certain the version of AM I am using is the latest, as I downloaded it the day after Outdoor Living Stuff released, and as stated previously I then used the updater from Mod the Sims.  The error claims to be mismatched core programs, and indicates that AM is the problem.  I believe there was another post in this thread from some one else who stated they also were having difficulties with non-Steam related versions, but the replies thus far have appeared to be either flames for grammar, lack of programming knowledge, and/or comments aimed at Steam users, but no real answer or suggestion has been given concerning the problem with AM not functioning correctly with updated, non-Steam version games.  

I am hoping that perhaps by drawing attention to the lack of attention being given to this part of the problem, a solution or suggestion could be provided.

Thank you for your time.