This is a quick, generally portable [it writes a couple of registry entries] app that requires no installation -- just run it. It lets you choose different levels of control over the autoupdate to win10, so you can temporarily turn the update notification off, disable it, or turn off new Windows version updates in Windows Update entirely.
blog.ultimateoutsider.com/2015/08/using-gwx-stopper-to-permanently-remove.html