With regedit, navigate to... or establish...
\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU
Create REG_DWORD (dword 32-bit) for AUOptions and set to 2 ....
There are other postings online about this setting, you can alternatively use gpedit.msc, but it is not the same as the older instructions posted in this thread that used to work until recently. Here's one link with references, but it's difficult to navigate because the page has multiple instructions and adds to scroll through... https://www.partitionwizard.com/clone-disk/disable-windows-10-update.html