I'm using Avira since 2005 and have covered my family by purchasing 5 license pack. Initially I could manage all 5 individually and see which license was not being used. NOW it's all the contrary. I only pay and have no control. It shows me that I am the proud owner of 5 licenses but I can't do anything wit them. My wife is currently using avira free edition as I have no access to the license I initially had for her. But there is a nice big button very easy to find, in order to pay for an other new license. Great job guys. Thumbs up, you are my hero's.
You can manage and control your subscriptions at https://my.avira.com -> log in -> subscriptions. And install the products from there. No need to insert the license keys if install from there.
*Also access the website using the same email used to purchase the products. If you don't know the password, click "I forgot my password" and create a new one.