Upgrading Xcode using App Store download problem
I don't know if this is your problem but look and see if you have any hidden purchases on your account. The way to check is:


Launch the app store &amp; Select Store > View My Account and sign in.
Look for a section headed iTunes in the Cloud, with a Hidden Purchases entry, and click View Hidden Purchases.
Click Unhide for those purchases you wish to appear in your App Store Purchases window, then click Done.


Let me know if this helps.