A question about licaenses in Avast Free Edition

I am using Avast Free Edition and the 1-year license is about to be over. I have already registered. I have read that i can get another key once the 1-year period is over but i dont know how to get it. I have tried resending the license key through this website http://www.avast.com/resend-license-free-antivirus.php “but we have no record in our database for the email address provided”. What should i do?