I downloaded iOS 8.0.1, tried couple of times - 'Install Now', it asks me to enter passcode, then it asks me to accept 'Terms and Conditions', once accepted it shows message - 'Verifying update...', after some time it shows message:
Unable to verify update
iOS 8.0.1 failed verification because you are no longer connected to the Internet
Though I am connected to Internet :(
I am trying to upgrade it on iPad mini - retina display.