I believe its how I did it in the past:
"1. Use the Windows key + R keyboard shortcut to open the Run command.
2. Type regedit, and click OK to open the Registry.
Browse the following path:
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows
3. Right-click the Windows (folder) key, select "New" and then click "Key".
4. Name the new key "WindowsUpdate" and press "Enter".
5. Right-click the newly created key, select "new", and click "Key".
6. Name the new key AU and press Enter.
Inside the newly created key, right-click on the right side, select "New", and click on "DWORD (32-bit) Value".
7. Name the new key AUOptions and press Enter.
Double-click the newly created key and change its value to 2. It's for "Notify for download and notify for install". Click "OK".
8. Close the Registry to complete the task."