Trying to preorder Cod:AW for my son, but what the hell? Why can't I select store pick up at Gamestop? It says on a banner that it can be shipped or store pick up but in my cart it says "store pick up not available". Basically same thing at Walmart. I saw where the download is about 46gb. Is there a difference in the disc version and download version... meaning if you have the disc version do you still have to install 46gb to the hard drive any way?