No Update box to to activate Licence

Hi everybody

Please have mercy in case that's a stupid question.
I simply want to activate my licence key to get updates. I followed this article:
https://docs.generatepress.com/article/updating-gp-premium/#activating-updates

I navigated to appearance-->GeneratePress

But I can't find the mentioned update Box!

When I installed GP Premium there was a message that no plugins could be found to install but it seems that everything is installed fine.

How do I activate my licence and start building my website?

Thanks