Hi Andrew,
I solved this by running: !pip install fastai --upgrade -q
I then have to restart the runtime. Occasionally I have to restart twice. Not sure why. I will link to the original thread where I found this solution when I find it.
EDIT: Here is the link to the original thread, though I did not have to downgrade pandas: ModuleNotFoundError: No module named 'fastai.vision.all' on Kaggle Notebook
Warm regards,
Ari