Upgrading Avast 7

I just received my box copy of Avast Pro. Since I already have Avast Free on my computer, where can I put the key I got into the Avast Free to upgrade it?

click the upgrade button (below register now) and follow instructions

https://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=1073

I already registered under the free license, and the “Register Now” button has disappeared and the the only one left is the “Insert Avast Pro/Internet Security license file”. Do I have to re-activate my license, and how would I do that?

Will this help?

Inserting the license key into: avast! Free Antivirus, avast! Pro Antivirus and avast! Internet Security.

Resend purchased license: http://www.avast.com/en-eu/resend-license-paid.php

I’m appreciate your help but it still doesn’t work. How can I re-activate my license with the IS key without unistalling and re-installing the program?

Free or paid.
You’re in a non consistent situation.
Maybe download the paid version setup and run it over the existing installation.