The only option for anyone who doesn't want to upgrade is to turn automatic updating off, keep it turned off forever, and manually verify every update you receive, making certain the update to Windows 10 is unchecked every single time. Microsoft only going to become more aggressive and more deceptive about this in the future. They can no longer be trusted with their own product. Windows Update has become no better than the adware-infested installers that CNet or Sourceforge wrap applications with.