I'm going to roll back to iOS 7.1.2 on my iPad Air while it's still being signed, iOS 8 is just too choppy (animation wise) in places for me. Obviously when I downgrade and connect to WiFi, the iOS 8 update will download to the iPad. Does Apple still allow us to delete the install file and free up that room again? If not I'll just pack the iPad to capacity with apps so that there's no spare room for it to allow the download to begin. Cheers.