Hi Gonzalo,
I see the button but it doesn’t respond. I am running Windows 10 64-bit. I also notice that there is no sizing available for the window. Whereas it use to offer a small/large option, it is not fixed to a specific size (this is fine, but mention it in case it serves as a clue).
What you say about the software makes sense, so I agree the licensing is likely not the issue.
Best,
Paul