Xcode 6 & El Capitan
Re-enables launching of older versions of Xcode on El Capitan. Xcode 6 supposedly has issues creating corrupt archives on El Capitan, which is why it's been disabled. Do so at your own risk!
- Disable rootless (temporarily) with
sudo nvram boot-args="kext-dev-mode=1 rootless=0"
- Then reboot
com.apple.dt.Xcode-> Item 0 ->
- Reboot again, for good measure
- Remove and reinstall Xcode, launch it, make sure it's good