Problems with license number on installation

I originally installed the free AVG software but kept getting notices that my antiviral protection and firewall were weak, so I bought a one-year upgrade online. This is one that you have to install yourself through an email they send you. The last stage of the process is entering your License Number when prompted, but I was never prompted. 

When I searched on my laptop for AVG, it seemed to show that it's installed and also showed my license number, so I'm a bit confused. Can anyone explain this please? Many thanks.