All settings are done in the computer catalog groups. At the top level "Computer Catalog" properties, I have the Policies: avast! Antivirus -> Updates: Update from EAS. Under Communications: I have the EAS address set, and the option to "Try to find an alternative server if unavailable" checked. Push and Pop selected.
On a computer sub group that stays "frozen" with Deep Freeze, I have the properties set for Policies: avast! Antivirus -> Cloud Services: enable streaming updates checked.