Minecraft demo bristling with official purchase?

Greetings, I'm facing the situation that a few years ago I bought Minecraft from the official site, but now after several months without gambling I want to run it again.

I've updated everything, new graphics card drivers, logged into the launcher and Minecraft still only lets me access the demo! I had already written to support, but they need an invoice number if possible, which I no longer have after 6 years or so.

When I go to the website and log in it also says that I already own the game. Does anyone know a trick or something similar that you have to adjust to make it work again?

Have you reinstalled the launcher and logged in again?

Juup just done again, nothing happens