Corrupted Jupyter file provided in "Credit risk Modelling" Course

The jupyter notebook provided is corrupt, it shows "not a json format" if we open it in Jupyter notebook. I am talking about the notebooks that are available for download in the course. Maybe its a version problem. SO please upload the .py file. Or jupyter notebook compatible with latest version. Kindly provide the notebook as the code is very large in quantity. Waiting for you reply. Thank you