Download Avira antivirus definition update.
you can download from here :
download avira for offline update
save to your hard drive.
then...
open your Avira antivirus software installed.
And select in menu tab :
Update - Manual Update - and select .vdf file you download.
follow instruction from picture below.
update avira for offline / no internet connection
you can download this picture. right click on picture and select save image as.
