Note that this forum topic is for the 2019 course. The 2020 course is now available, and we recommend following that instead.
If you still want to access part 1 of the 2019 course (e.g. because you’re already working through it) it is now here:
This course requires fastai v1. To stop fastai from updating to v2, run in your terminal:
echo 'fastai 1.*' >> $CONDA_PREFIX/conda-meta/pinned