To use this key you MUST activate it at setup, so that mean if you already have avira just reinstall it and activate.
To activate the key:
once you get here in the setup click "license file" and locate the file and double click it. then it should continue the setup
virus scan:
https://www.virustotal.com/en/file/5...is/1368766342/
Avira_Key.rar - Le scanner antivirus de Jotti
file is even approve by avira