Q: Illegal license key - I have received a message that the license key I am using is an illegal or pirated key. What do I need to do?

A:

If you have received this message it means our licensing system has detected that you are using an illegal or pirated license key in your copy of avast! Professional Edition. It is quite possible that you didn’t realize this when you purchased it and that you purchased the key from what you thought was a legitimate source. There are very many websites which fraudulently sell avast license keys to unsuspecting users. Usually, they provide license keys for the free Home Edition but actually charge as though the customer had purchased the paid Professional Edition. Other websites provide illegally “cracked” keys. Whenever we become aware of such websites, we try to have them shut down as quickly as possible, but, new sites are emerging all the time. You can find a list of known fraudulent sites on our website: http://www.avast.com/eng/fraudulent-sales-of-avast-products.html

The only way to be sure that you have a legitimate license key is to purchase it directly from Alwil Software, from our online store, or from one of our authorized resellers, all of which can be done via our website:
http://www.avast.com/eng/purchase.html

If you are using a pirated key, but you would like to continue using avast, there are two possibilities:

First, if you’re happy with the paid Professional Edition, or if you need the additional features that it provides, you can purchase a legitimate key by clicking the link below and following the instructions.
http://www.avast.com/eng/buy-avast-antivirus-professional-edition.html

Once your purchase has been completed, you will receive an email containing your new key and instructions how to insert it into your avast! program.

Alternatively, you can convert to the free home product, avast! Home Edition, which is very similar to the professional product and is free. To do this, just click on the link below and complete the online registration. You will then receive a legitimate key and instructions on how to use it.
http://www.avast.com/eng/home-registration.php

Finally, if you believe you are already using a legitimate license key, you can contact us by clicking the link below and submitting a ticket to our technical support team who will check it for you. http://support.avast.com/