This is very common and has been covered on a number of threads, a search for setifaceUpdatePackages().
As is said in some of the errors, the server could be down for maintenance/heavy load, etc. try again if still no joy, try the steps below.
Check and ensure that your firewall is not blocking avast.setup.
Can you try to repair your installation?
Go to Control Panel > Add/Remove programs > avast! antivirus > Remove
Then choose Repair function in the popup window (Repair).
If nothing helps, better is uninstall / boot / install again / boot
Remove Avast using the uninstall utility from the Alwil website. Reboot and reinstall Avast. Try again to update. If it fails. Completely remove ZA, reboot and try again. On occasion I’ve seen ZA still blocking inet access even when it was shutdown.
Hi I’m having sum errors with automatic update.I have too computers and the one of them is connected to the net by cable modem but my owner computers use the 2 computer as a gateway and i wander what update connections i must select