Change registry value with command

overwrite windows update server

reg add HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU /v UseWUServer /t Reg_DWord /d 0

Optional: set windows AutoUpdate to disable

reg add HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU /v NoAutoUpdate/t Reg_DWord /d 0