So I have a restricted software to stop users from actually installing High Sierra. But when they are at home and on their own networks, they get the notification that High Sierra is out and if they want to download it. Some of our users have been downloading it, and trying to install it. Thankfully we've blocked the installer.
Is there a way to stop the notifications from Apple telling them about High Sierra. I vaguely remember there was something to stop Sierra ones when they came out.

