There’s a way to download all the files associated with the assignment. Here’s a recent thread from mentor Saif about how to run the notebooks on Colab. One thing to be aware of, though, is that once you run a course notebook on Colab, it’s not a good idea to upload that Colab version to the course website again. Colab messes with the internal hidden “metadata” of the notebooks, so that they won’t work with the Coursera graders anymore. But it’s fine to treat it as a one way trip. You can manually “copy/paste” back code if you discover something new while working on Colab.