It has been almost a week as Apple has disabled downloads from https://developer.apple.com/downloads/ due to a security breach.
If you don't have App Store set up for whichever reason, how are you supposed to be using your brand new Mac for development?
Is there a copy of Xcode hidden somewhere within a brand new mid-2013 MacBook Air?
How do I get Xcode if I don't have an App Store account? Nothing works without Xcode, I can't even use MacPorts to install the stuff I need, because it all depends on Xcode.