Lost access to special edition?

Im so confused I’ve been using goodnotes since 2022. That’s when I bought Goodnotes 5. Then in November 2024 I bought the Goodnotes Special edition. Today everything was fine in my first few classes but then later I opened the app and saw that I was logged out. I logged back in and I had Goodnotes 6 but it didn’t let me write. It said that I can only use three of my Notebooks so I was obviously confused. I didn’t know what to do because I had to use it in that moment for class. So I clicked on the Goodnotes 5 button. Well… Now Im stuck there. The only option I could find is a 7 day testing period for Goodnotes 6. But where did my special edition go? I literally spent 26€ on that… How do I get it back? I can’t find it anywhere.

I have the Ipad air 13 2024