Re: tenforums.com
Does method 2 steps 1 and 2 from the accepted answer stop the update? I assume if the registry keys are set the download won't restart afterwards.
http://answers.microsoft.com/en-us/windows/forum/windows_8-update/downloading-windows-update-stuck-at-0/cdb1a9be-7e4c-4de2-8e4b-47379d6a3d9a