Windows 10: TURN OFF Windows 11 updates but leave Windows Defender updates ON

My elderly parents use a PC with Windows 11 for very basic tasks i.e. email, web browsing and word processing. I want to disable any future Windows 11 updates so that their interaction with the OS never changes. For example, I read that there is a potentially large update in the Fall that will make significant changes to the home screen. However, I want Windows Defender to continue to update automatically. Is there a way to do this?Please note that my parents are clueless when it comes to navigating any settings, so the solution would need to be something that I can set up myself and leave a

:)

 

Windows 10 Anniversary Update Issues

Problems with W10 Anniv auto update:

Mom's: (x58 Xeon 5677) Windows Defender was not turned back on automatically (it was "on" in the 1511 edition) and she had a Trojan. Full system scan to eradicate.
Her Epson printer was knocked off, had to uninstall by Device Manager pull USB cable and reconnect cable. W10 did the rest.

Step-mom's: (HP pre built) Windows Defender not turned back on by default. Her USB Seagate Expansion Drive 2Tb was offline so all backup routines were halted. Had to rerun backup plan. Had her do a full virus scan.

Step-dad's: (Dell Optiplex tweaked upgrades) Windows Defender not turned back on by default. Full Scan.

 

SEtting up automatic updates for windows defender on windows 8

I have found this on the internet en have set up a task for automatic definitions update for Windows Defender but a window pops up when this starts to run.
Is there a way to set this without any window popping up so that it just runs in the background?

Now I'm using
"C:\Program Files\Windows Defender\MpCmdRun.exe" -SignatureUpdate -MMPC

I'm currrently using it as described here:
https://forum.raymond.cc/threads/let-your-windows-8-defender-update-itself-automatically.34359/

 

Why won't Windows Defender not auto update anymore

I have have windows updates set to notify updates , I will install myself, because I want to make a system restore point before installing updates.

Because of this windows defender does not update automatically and I had to create a task for updating in the task scheduler, which I did but it does not work anymore since I re-installed windows.
What am I doing wrong?