After clicking "OK", the CMD interface will pop up, as shown
below:
Enter:
pip3 install numpy
Then press Enter to start downloading and installing Numpy.
Download opencv_python.whl and install OpenCV
Download address:
https://www.lfd.uci.edu/~gohlke/pythonlibs/#opencv
After getting to this page, you may need to manually enter "#opencv" after the URL
to redirect to the location where opencv is located.