I would like to restrict anyone except Administrators from installing Windows Updates on my Windows 8.1 Pro x64 ENG machine.

In Windows 7 it's easy:
Control Panel / Settings / Windows Updates / change settings:
"Allow all users to install Windows Updates" -- uncheck to disable.

Is there a similar setting in Windows 8.1 via Control Panel GUI, secpol.mmc or regedit? I can't find it.

Thanks, all!