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It looks like a scam. Are you affiliate with http://avast-download-now.com?
For information about that see - http://avast.com/eng/fraudulent-sales-of-avast-products.html 
They are not our partners nor resellers.
This URL will be added to the list of similar sites on www.avast.com/eng/fraudulent-sales-of-avast-products.html.
Update: website updated
Is there any chance that you sue these fraudulent websites?