Method 1
Stopping upgrade mechanism permanently:
- In registry key HKEY_LOCAL_MACHINE\SYSTEM\Setup\UpgradeNotification,
set value UpgradeAvailable to0
:
- Reboot
If you already got trapped in band notification which cannot be cancelled, first get rid of it by Method 2, then return and use this Method 1.
Method 2
Stopping upgrade mechanism temporarily (if forcing pop-up has appeared):
If the notification appears without a Postpone option in the middle of your work, blocking all apps, and you do not want to restart your computer or install anything, you can remove it this way:
Launch Task Manager:
Press Ctrl+Shift+Esc and you will see that Task Manager opens beneath the notification, although its window remains unreachable.Switch to Task Manager:
Press Alt+Tab to switch to Task Manager. It will remain beneath the notification, but now it is controllable by keyboard.Remove displayed notification:
In Task Manager, using ↓ key (down arrow), highlight Modern Setup Host and press Delete key to terminate it. Your screen is no longer blocked by notification.Remove further notifications:
In Task Manager, kill process Windows 8.1 Setup (the root of all this trouble). This bought you time until next restart or until next run of scheduled task. Follow Method 1 if you wish to stop process permanently.Disable the scheduled task (optional):
Scheduled task will restart the Windows 8.1 Setup process if you killed it. It runs at 20:00 so if you do not plan to reboot before that time, you should disable it.
Start Task Scheduler, navigate to Task Scheduler Library → Windows → Setup, select task 8.1 auto install v2 and press Disable.