You may be able to do it with the registry:

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Signature Updates

Set 'ScheduleDay' to 8
(8 = Never)

I think I've found a solution to Windows update prompting to install defender updates.

In the Windows Defender group policy editor in the Signature Updates section -> 'Specify the day of the week...

Hi

Thanks very much for this article. It worked perfectly here with a couple of caveats.

First of all, I had the Windows Defender notification in the task bar nagging me that the service was...