If you're on the Fast update schedule for new Builds, you may have gotten this: error code (0x80246017)
Here's the explanation:
"This error is caused by a recent update (KB3035129) from Jan, 29.
This update exposed to users an interface that is not supposed to be shown and offered builds
that are not intended for those users, but for Microsoft employees only."
A fix to correct this error and hide this interface is on its way, so you should not change your update settings
and do not try to download any builds-that will always fail and with the same error code!