Preventing the Upgrade to Windows 10

Stop the upgrade to Window 10 if you are on Windows 7 or Windows 8.1. When you are ready, this utility can turn back on the upgrade to Windows 10.

GWX Control Panel

http://ultimateoutsider.com/downloads/

Update: There is an Enable & Disable button. You may need to enable the new version and disable the old version.

Blocking Windows 10 Automatic Updates

Some ways you can try to block Windows 10 Automatic Updates. Effectiveness is unknown until I try it.

http://www.askvg.com/fixing-windows-10-automatic-updates-install-problem/