Here is a suggestion for stopping the annoying Windows10 upgrade popup
Uninstall this Windows update:
To find the list of installed updates: I entered Windows update in the Start search box then went to View installed updates
Unfortunately this update returned within a few days so I uninstalled it again then changed my update preferences to avoid automatic updates of optional updates. I now install only the important updates manually. I also *hide* most optional updates by right clicking on them and choosing *hide*.
Just type *Windows updates* in the Start Search box (lower left corner) and go to *check for updates*.