Please use this AntiVir VDF update, if you are using one of the following Avira products:

• Avira Free Antivirus, Antivirus Premium and Internet Security
• Avira Professional Security
• Avira Server Security
• Avira AntiVir Personal, Premium and Premium Security Suite from version 9
• Avira AntiVir Professional (Windows) from version 9
• Avira AntiVir Server (Windows) from version 9
• Avira AntiVir SharePoint from version 3
• Avira AntiVir ISA Server from version 3

How to install Avira manual updates?

1-Start Avira Antivirus and from the program interface ( menu ) select "Update" and then choose - "Manual Update".
2-Now you need to locate the IVDF file ( latest definition file ),  select the IVDF file and click "Open".
3-A small window should appear and notify you : "The virus definition file has been successfuly updated", click "OK" and your antivirus should be updated.

you maybe like also
Download Avira internet security 2012 – With license Key free
Download Avira AntiVir Rescue System 2012 [Rescue CD] to Clean Unremovable