I found this post on https://www.redmondpie.com/disable-turn-off-automatic-updates-in-windows-10-heres-how/comment-page-2/
I have not included the preamble but this seems to disable Microsoft Update if you follow it do it at your own risk . I am doing it to see what it will do and will report back if it works
*** Note : You must be logged in with an administrator level account.
- Start by selecting COMPUTER / LOCAL DISK (C:) / WINDOWS / SYSTEM32
- Scroll down and RIGHT CLICK on WindowsUpdateElevatedInstaller.exe and select PROPERTIES.
- Select the SECURITY tab and click the ADVANCED button. Click CHANGE on second line next to Owner.
- In the Object Name Box, type in the USER NAME of your Administrator Account and the click on the CHECK NAMES button. The FULL Admin Account Name should now appear in the box. Highlight the Admin Name and click OK.
- The OWNER should now be your Admin Account. Close this box and then immediately re-open. In the list box below, double click and select ALLOW ADMINISTRATORS ( your admin account ) and check ALL available permission boxes. Click on OK. Re-highlight ALLOW ADMINISTRATORS in the list box and click on APPLY. Next click OK and OK a second time to return to the SYSTEM32 File List.
- Right click on WinUpdateElevatedInstaller.exe and select RENAME. Remove the highlight and move cursor to last character before .exe and add an X to the end of the file name. ( ie... WindowsUpdateElevatedInstallerx.exe )
- Next, scroll down the SYSTEM32 File List to WUAPI.DLL and repeat steps 2 through 6.
- Scroll to WUAPIHOST.EXE and repeat steps 2 through 6 again.
- Scroll to WUAUCLT.EXE and once again, repeat steps 2 through 6.
- Close all open windows and return to desktop.
- Finally - Select CONTROL PANEL / ADMINISTRATIVE TOOLS / SERVICES ..... and RIGHT CLICK on WINDOWS UPDATE. Select STOP and then select PROPERTIES. In the center of the box, select the drop down arrow at the right of the STARTUP TYPE text box and select DISABLED. Hit OK and close all windows to return to desktop. Select START / SHUTDOWN / RESTART and re-boot your computer.
- Upon rebooting, go back to CONTROL PANEL / ADMINISTRATIVE TOOLS / SERVICES ..... Scroll down to Windows Update and verify current status is still DISABLED.
"Close all open windows and breath a satisfactory "Hell Yeah !" You now have full control of the Windows Update Utility and can now toggle the service back on / off anytime you wish to check for updates or disable the service."