I tried skip a long Xcode download by using a coworker’s Install but now the Mac App store is linking Xcode to my coworker’s iTunes account. I couldn’t find a way to delete that install from my Mac App store, now every time I try to update, I’m prompted for his password. To get around it I had to download Xcode from another computer with my account, transfer the install files over and then reinstall. I still haven’t found a fix for the problem where my the Mac App store is linking Xcode to another account but at least I’ve got the latest Xcode update. I hope most of the crashes are fixed, that would make the hassle worth it.