xcode won't update
I have a MacBook Pro (Retina, 15-inch, Early 2013) running OS X Yosemite. I'm not able to update Xcode from 6.3 to 6.3.2 in the App Store. When I try, a dialog pops up saying "This item is temporarily unavailable. Try again later." How can I resolve this issue and upgrade Xcode?
MacBook Pro with Retina display, OS X Yosemite (10.10.3)