I downloaded iOS 9 OTA on an iPad last night. After downloading, it asked if I wanted to proceed installing. I clicked 'Later' intending on installing it this weekend once I back it up. Today I picked up the iPad to use and it had magically installed iOS 9 and prompted me with the 'Hello' screen! Does iOS install itself later if manually downloaded? PS: Other people at the house have access to it and its not password protected so someone else could have installed it. I'm just curious to know if it's a possibility that it would install itself.