First, I'm an Avast user not an Avast Team member.
I'm not sure where you started trying from, whilst the Tech Support (physical location) is closed, there should be Avast Team members connecting remotely to monitor support issues.
I started out at this URL
https://support.avast.com/en-ww/contact and that gets you to a form to create a support ticket.
1. What can we hep you with - I chose the option with License Issues in the text.
2. How can we help - I chose the text with 'help with a different subscription' - the closest to what I think you need help with.
3. When you click next you get form to complete.
Here you are effectively asked questions relating to your purchase, when it is asking for an email address you need to enter the one you gave when you purchased. It also asks for your Order ID, you probably won't know that either, if not enter 00000000 it should allow that. Now give as much information as you can in the Details window to help them find your order so that can resend the license.
