Note: Support tickets are handled on a First In First Out and can take between 5 and 10 working days, depending on payment method. Whatever you do don’t submit multiple tickets as this throws you back in the line.

Also try - Resend avast License https://www.avast.com/resend-license-paid.php, 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.