The virus definition files of an installed antivirus program must be updated regularly for security against the latest viruses. Generally, the antivirus software installed contact the servers and downloads the required files automatically. At times, due to the servers being saturated or problems cropping up with downloading the files, a manual update of the AntiVir Avira virus definition file may be required. To update manually,the latest virus definition file must be downloaded. There is an option in the AntiVir Avira antivirus program to manually update the AntiVir Avira virus definition file. When prompted, the downloaded file has to be used with the program to complete the update.