Click on Start menu and search for “Registry on.
Open the Registry and got to the following path –
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows
Once you are here, right-click on Windows and choose New and then Key.
Rename the new entry to WindowsUpdate
Now, right-click on the WindowsUpdate entry and select New and then Key.
Following that, rename the new key as AU
Now, right-click on the AU key and select New and DWORD (32-bit) Value.
Rename it to NoAutoUpdate
Now, double-click on “NoAutoUpdate” and change the value data to 1. Press “OK”.
Now, close the Registry Editor and restart your PC. You will now find that Windows 10/11 update has stopped completely.
Source:
How to Disable Windows 10 and Windows 11 Updates Permanently