None of this is necessary. The pop-up that keeps prompting you to upgrade gets installed by update KB3035583. Just uninstall and disable that particular update and you won’t be pestered to upgrade again.
Depends on what you're running, and what you're running it on. Some folks don't get bothered at all, others get hounded. The fixes for each may differ.
I'm glad it was simple for you. :-)
bfl