How to switch back to Avast free?

Hello,

My license for Avast Internet Security just expired, and I want to switch to the free version, but have no idea how to do it. I went online, and registered for a free license key, but I don’t see where to enter it. The software is asking for an activation code for internet security, and there are three fields that don’t match the free license key. How do I tell the program I want to go back to the free version? Do I need to completely uninstall, and reinstall the free version?

Any help would be greatly appreciated. Thank you.

Hello,
I figured it out. I had to actually start the uninstall process, and the program gave me the option to switch to the free version.