Hello,
Use the psexec tool to run the command on any othe remote system
http://technet.microsoft.com/en-us/sysinternals/bb897553.aspx
psexec [\\computer[,computer2[,...] | @file][-u user [-p psswd]][-n s][-l][-s|-e][-x][-i [session]][-c [-f|-v]][-w directory][-d][-<priority>][-a n,n,... ] cmd[SepLiveUpdate /q]
For 11.x use "Luall.exe" command
For 12.x use "SepLiveUpdate.exe" on the
path C:\Program Files\Symantec\Symantec Endpoint Protection
C:\Program Files (x86)\Symantec\Symantec Endpoint Protection