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HI I have been using avast free for many years. I should tell you that you do not get a key with the free avast version you just register it through the Maintenance tab. Then click on registration and fill out your name and email address and click register. That is it. Make sure sure to uninstall avast pro version first and then go to the avast webiste and re download the free avast version to your computer and install it and register it and reboot your computer and you are done.
have a good evening