I have just upgaded from 3.7 to 3.8.
My Script worked perfectly fine, until I have upgraded to 3.8.
I have this line of code:
from PIL import
You can try to install from the wheel
pip install Pillow-6.2.1-cp38-cp38-win_amd64.whl
Note : This wheel is for windows 64 bits and cpython 3.8 if you want to install manually for a different system, you have to use another one.