Windows 10 is great but the forced upgrades are ridiculous. As far as I can tell there is no known way to permanently disable the updates. If you disable the update service, there are scheduled tasks that run regularly to re-enable them. If you cancel the scheduled tasks, as soon as you reboot your computer they get added back. The possible solution is that there should be a registry key you can set to alert you that windows 10 updates are available instead of automatically installing them.