I experienced the same problem, and my guess is that you should not attempt to validate your game cache. I did that on Crossworlds, and that's when all my problems started. Not sure if vallidating AP also causes the problem.
I resolved my endless downloads, game unavailable, wrong version errors by deleting Crossworlds and AP. I then redownloaded AP then Crossworlds. I haven't turned off auto-update, maybe I should.
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