Hi there!
I thank in advance for your help. Thing is that my avast free registration is about to end. So, I try to register via online option in the program and nothing happens. I get to the screen qhere you must choose de standard or enhanced($) edition, and I click ‘select’ over and over again and nothing happens. I just get the screen again.-
So, I say ‘Let’s give a try to the offline registration’, and sent a message and got a mail with the license key. When I insert it in the offline registration whereabouts, avast tells me that the code is not a valid key.-
As far as I know, I am not THAT stupd as to be pasting it in the wrong place. Just copy the license key in the mail and paste it where it should(and, where avast tutorial says so).-
Any ideas?
Thanks!

Do you have a hosts file in place that blocks some web sites? That has been known to block the registration process (which arouses suspicion, but it is what it is).

-Noel

This is a known problem with v.2021. Please refer to this thread https://forum.avast.com/index.php?topic=152804.0 - 2nd to the last post.

If the post made by MartinZ does not resolve your issue, then an uninstall of Avast using the Avast Uninstaller tool, and a fresh install will resolve the problem.

As you can see from the thread, I had the same problem. Let us know if you have any additional questions or concerns. Thank you.