Why is it not wise to access AVAST DB server?

When I get that announcement email about new databases from Avast, I read it and manually right click the Avast tray icon and choose Updating…iAVSupdate.
(And Avast accesses AVAST DB server and downloads and installs new database.)

How is this done?
Avast Setup info log:
Running setup_av_pro-118(280) … with Cmdline: /downloadpkgs /noreboot /updatevps /silent /progress …

And my question for the Alwill team remains: is it possible to start this same setup command line operation manually ?