The error is being displayed right after the user agrees to the terms and conditions of the OTA update.The error says nothing more than “An error occurred Downloading i OS 10″It is a fact that Apple tries to push each major software update to as many of its devices as possible, and this is something which Apple takes pride in.
If you see one of the errors below, your computer might not be able to connect to Apple servers or your i Phone, i Pad, or i Pod touch: If you see error 1015 or a message that "the required resource can't be found," your device might have unauthorized i OS modifications (jailbreaking).
Or you might be trying to install an earlier version of i OS (downgrading).
Please note that the error appears at the end of the restore process, a period when i Tunes is writing or updating your baseband.
If you see error 1671, i Tunes is downloading necessary software. To see how long the download should take, click the down arrow in the upper-right corner of i Tunes.
All have been made available to i Pad & i Phone users for free (assuming it's a recent enough model to qualify).