Error on preamble import

[Iouri31]

I'm getting this error: ModuleNotFoundError: No module named 'preamble'. I've read the post from 2016, but it didn't help. When I try to reinstall the matplotlib, it shows the directory, where it installs. But I can't find the preamble.py file neither there, nor anywhere else on my machine.

[amueller]

Hi!
How did you download the notebooks? The preamble file should be included with the notebooks in the same folder.
Hth,
Andy