You can run the tutorial locally by cloning the repo from the folder you want to work in:
git clone https://github.com/marylou-gabrie/tutorial-sampling-enhanced-w-generative-models.git
or downloading the files directly from the Github interface.
To use the tutorial on Colab you will also need to download the entire folder (use one of the solutions above). Then, add it to your Google Drive and open the notebook tutorial_sampling_enhanced_w_generative_models.ipynb from there.