I’ve noticed the update failing more often for about a month … googling it mentioned that it was due to Avira’s server being overwhelmed. So I was patient, updated manually each time, but it just became too tedious — tried this command, too, after reading it from a moderator in a thread in the Avira forum that didn’t work either:
“C:\Program Files\Avira\AntiVir Desktop\update.exe” /DM=”0″ /NOMESSAGEBOX /receivetimeout=120
Finally, I found this command that worked, so sharing it for other’s benefit:
“C:\Program Files\Avira\AntiVir Desktop\update.exe” /DM=”0″ “/NOMESSAGEBOX”
Hope that helps.