Stop Windows 11 Upgrade

1. Type regedit in the Run windows and hit OK to open Registry Editor.

2.  Navigate to the following path, right-click it > New > DWORD(32-bit) Value. Then, double-click the new registry settings, name it TargetReleaseVersion and set its value to 1. 

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate