I had work done on my computer or changed harddrive I need my license key to get my advast to work again I paid for it how can get full function back?
Use this link: https://www.avast.com/resend-license-paid.php
As mentioned, use the - Resend avast License https://www.avast.com/resend-license-paid.php.
A point to note, you will need to enter the email that you used when purchasing the license, e.g. the one that the original email with the link was sent.