I had the same problem. I was able to successfully download Dead Nation following these instructions: http://us.playstation.com/support/answer/index.htm?a_id=2408
PSN has a link up on how to fix the problem. I can confirm that it works because I had the same issue. However, I'm now unable to sign in to PSN (it says it's undergoing maintenance). http://us.playstation.com/support/answer/index.htm?a_id=2408
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