I have been using the free version of Avast and the subscription expired so after searching online through many help sections found a link that took me to where you can request a new free registration. For some reason in the UI, it was impossible to actually find this - it kept trying to make me purchase a subscription. I received the activation email with the new license code. The instructions say go to Maintenance and click on Registration. However, under Maintenance there is no section for Registration. There is only a section for subscription. Thinking that maybe this was the same thing, I entered in my license code in the only spot that made sense - under activation code. Of course this didn’t work because there weren’t even enough spaces for me to type in the whole thing. Where am I supposed to enter in this registration code? I have a very uneasy feeling that it is so difficult to find where to get the free registration code and enter it in because they are trying to force you to purchase a subscription. It’s a bit disheartening.
Does your avast UI home page look like this image ?
If not you may well be using the Pro/AIS trial.