Jupyter Notebooks unavailable in Data Analysis with Python Course

I’m currently doing the Data Analysis with Python Course, and exercises and its solutions are supposed to be in this website (notebooks.ai), which for whatever reasons doesn’t accept new members (No sign up button).
You can still see the notebooks without a problem, but the solutions to the exercises are unavailable (Example)
Is there some kind of measure that was taken so that you can finish the course that I’m unaware of?
Thank you for your time in advance.

A post was merged into an existing topic: Cannot create an account on NOTEBOOKS_ (Python Data Analysis)