If you previously hid KB305583 in WIndows Update to prevent M$ foisting their "Get Windows 10" (GWX.exe) adware/nagware/crapware on you, it will have reappeared in the last couple of days because it has now been "updated".
The more cynical among us will probably recognise this for what it is - a sneaky attempt by M$ to foist their unwanted crapware on us.
Just a warning in case this catches out the unwary.