Turn OFF windows update using Group policy

TurnOFF windows Update Using GPO

Go to your Group Policy management console and navigate to Administrative Templates | System | Internet Communication Management | Internet Communication Settings

Set the “Turn off access to all Windows Update features” to Enabled.

If this policy setting is enabled, all Windows Update features are removed. It does not allow the client pc to access  the Microsoft Update and Windows Update Web sites. The client pc will not get automatic updates directly from Windows Update , but it can still get updates from a WSUS server in the network