Avast update

Hello every one
I have a privet network and all PC’s have avast free antivirus
all PC’s log in to internet through Firewall
after check web traffic i see some PC’s download 3 GB today only
http://imgur.com/a/IyJ6R

is this normal

It depend on the what is downloaded.
e.g.

  • the size of the VPS is different each time.
  • it depends if a update already was received by a push-update or not
    etc.

Can you give me antivirus database update url