# install msys2
https://www.msys2.org/

# update msys2
pacman -Suy

# install python && pip in msys2
pacman -S mingw-w64-x86_64-gcc mingw-w64-x86_64-python3 mingw-w64-x86_64-python3-pip mingw-w64-x86_64-python3-setuptools

# install packages from requirements.txt (in msys2 mingw64)
pip install -r requirements.txt

# if it does not work by pip, install python-pillow in msys2
pacman -S mingw-w64-x86_64-python-pillow

# add python (default: C:\msys2\mingw64\bin) to system variable PATH

# restart computer to refresh system variables, and if done well you should be able to build and run this app