Support - ading an extra licence

Hi

Hope someone can help.

Bought a one year licence for my machine of 4.8 pro in July.

I would like to ad another machine to the licence…
what would be the most cost effective way?

I tried to raise a support ticket for this. but could get a an authorising email to open an account.

Many thanks

You can contact sales@avast.com and explain.
But I suppose you need to buy another license, just that.