Thanks Rafeeq for the info. I deployed one package in interactive mode, unchecked the Run LiveUpdate, I noticed there did not start any of the liveupdate processes (luall.exe, lucom.exe etc), and yet after about 15 mins, I got my client updated to current AV definitions on site. :( I guess Symantec has a natural desire for updates, which is most of the time very good, I'd say.....
I'm going to test now the msi installer option with the command line and proper switches.
Thanks,
Mitacus