All the files have been downloaded, but can not run on my own comuputer

Oh, sorry, I think I gave you the same info on a different thread a couple of hours ago. The kernel error may indicate that your Jupyter software is not configured correctly or perhaps you need to modify the “ipynb” file to tell it that the server is your local Jupyter instance and not the Coursera server up on AWS. Mind you, I have not tried to do this and make no claim to understand how it works. But if you want to play this game, then you need to have the skills to find the answers to questions like this. E.g. try googling “how does a Jupyter notebook know where the kernel server is”.

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