I have used the following powershell commands to stop auto update in Windows 10 :
> New-Item -Path HKLM:\Software\Policies\Microsoft\Windows -Name WindowsUpdate -Force
> New-Item -Path HKLM:\Software\Policies\Microsoft\Windows\WindowsUpdate -Name AU -Force
> Set-Itemproperty -Path HKLM:\Software\Policies\Microsoft\Windows\WindowsUpdate\AU -Name NoAutoUpdate -Value 1 -Type DWord
Now restart the computer
> shutdown -r -t 05
But is not working , Windows 10 always install kb4511553 , blocking ExcelLink communications with Mathematica 12.0