Impossible to download Python Notebook from L9 : error

Short Course Q&A Building Systems with the ChatGPT API
1

Using File->Download as Notebook and nothing is happening. Works fine for L1 to L8.

Any idea where the problem might come from ?

2

does this help: Notebook (.ipynb) download fails silently - Short Courses / LangChain for LLM Application Development - DeepLearning.AI