This method seems to work best…
Method 1: Disable “Get Windows 10 Upgrade App” using Registry Fix
http://www.windowsmechanic.com/remove-get-windows-10-upgrade-icon-taskbar-registry-fix/
Download the fix at
https://www.dropbox.com/s/b8hxu53vh4lljof/Disable%20Get%20Windows%20App%20icon.zip?dl=1