My Avast expired what do I do?

[zephyrs]

Hi!  My avast expired.     I was using a temporary one, on top of a paid one.     I didn't get around to informing them that I've already paid for it, since I did my last computer restore.   So when I downloaded Avast, it was a temporary kind.   I didn't know how to reinstall it as having been already paid for.   So what do I do about it, now?
     Thanks.
                                                 Debby

[Lisandro]

I didn't know how to reinstall it as having been already paid for.

Right click the 'a' blue icon, choose About, then the Registration key. Add your own key.
If you're connected to Internet, avast will automatically update.
If you receive an error, your key could be corrupted (cracked?) and then it's better contact Alwil team