I just purchased a new Mac two days ago, but I am unable to download or update anything from the App Store. When I try updating, I get the error message 102 saying it has timed out. I'm on a rMBP 13" 2013 with a 3.0GHz i7, 8GB RAM, 512GB SSD. Running 10.8.3. When I update, it goes to waiting to 0 of ___mb, then I get the error message. Please help, it's very much appreciated.