Unattended installation/update of client version

Hi all,

I have a lot of clients that still have SEP version 12.1.1 and we are now at 12.1.3. We have deepfreeze on all our machines so it's hard to update them during the day while students are using them. Is there anyway to have symantec push out the updated client version without some one at the PC? I can push them from our symantec server but I wanted to do this at night when nobody is here. Any information will be helpful. Were also using a GUP so this would help with that too.

Thanks!!!!