Steve has Windows 8.1 on his laptop and it's constantly bugging him to update, but he doesn't want to. He's concerned with Windows 10's privacy issues. Leo says it's true that Windows does phone home and will send stuff to the home office, but it's largely for things like preferences, data requests pertaining to Cortana, etc. Steve should just customize his install when he installs it and he can turn off those things one by one. But they've been doing that since Windows XP. It's really much ado about nothing.
If he's interested in preventing a Windows 10 update, Steve Gibson has a utility called Never 10. It will disable the upgrade.