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There is a special offer from Avira (german site) giving you a free license key of Avira Antivir Premium for 6 months with free updates.
To get your 6 months free license, visit https://license.avira.com/de/promotion-a8ydzq3fgnsu051rwq81
Fill up the form and wait for an email from AntiVir .. The license key, HBEDV.KEY will be attached with the email.
Install the antivirus and during installation, you will be prompted to import the key. Voila.. you now have a fully functional licensed AntiVirus for 6 months!