Hello, I have been having trouble getting xcode 4.2 to install. I was having trouble submitting my app to the app store and I read that reinstalling xcode could help solve the problem. I uninstalled xcode 4.0.2, and downloaded xcode 4.2 for snow leopard from the developer portal. Now when I open the disk image and start installer and try install it it says "Installation Failed". How can I solve this problem?