Unplug power for about 5 min, restart it & try again. Also some discussions on Apple forums that updates not working well over Ethernet but are successful via Wifi.
Unplug power for about 5 min, restart it & try again. Also some discussions on Apple forums that updates not working well over Ethernet but are successful via Wifi.
It downloads the update, goes to "step 1 of 2' gets almost to the end of the indicator bar, then seems to hang and gives the ' not successful ' error message