Avira Free Antivirus for Mac version 2.0 is a new major version therefore it is not possible to perform a product update as usual. An update of the product requires a new installation.
For more information concerning the new Version 2.0, see the Release information.
Necessary steps for an upgrade:
Avira Free Antivirus for Mac Version 2.0 does not support the central manageability of the Avira Management Console (AMC).