Get GWX Control Panel, it stops it, even when Microsoft decides to resend it. You will find it at ultimateoutsider dot com.
He hid it already but it came back, i believe i read somewhere something from abbodi1406, it's not comming "back" but is re-offered as a new revision.
At this moment it only comes back once. So hide it, and hide it again, and it'll stop. Then watch out for MS posting it more later.
true, it won't stop telemetry or anything like that. just keep windows 10 from asking to install. it's just a simple reg edit and only does that