My new subscription is ready

I have Avast Premium on my PC. It renewed automatically and is good for another year. When I go onto my account page on Avast it says: “your new subscription is ready. Do you want to download the app now”.

Why is this? If I already have Avast and have paid for it. Do you have to download the app and use the validation number every time Avast renews?

If that’s the case, that’s not good. It’s an annoyance.