Install automatically only the Windows Defender's Update

Maybe in: gpedit.msc -> Computer Configuration -> Administrative Templates -> Windows Compenents -> Windows Defender

 

It should be, the following is the batch file I use to update MSE definitions, you would need to correct the path statement to direct it towards the mpcmdrun.exe file in your windows defender directory.

Why not install MSE, then use the script below to update it, copy and past the text into notepad, select save as (make sure you select all files from the file type drop down menu) and name it MSEupdate.cmd

Save it to your documents directory and create a shortcut and place that shortcut in your startup directory in your start menu (just right click on startup and select open or explore then paste a shortcut into the the window, make sure you select paste shortcut).

MSE shoud update on every restart.

Code:

c: cd C:\Program Files\Microsoft Security Essentials
start /min MpCmdRun.exe -SignatureUpdate