I don't think that NumPy for Python 3.6 is out. Try with 3.5
Or try to install it manually.
C:\Python36\pip.exe install C:\downloaded\numpy.whl
You have to replace all this with exact paths to a pip.exe and the downloaded numpy wheel file
Or try to install it manually.
C:\Python36\pip.exe install C:\downloaded\numpy.whl
You have to replace all this with exact paths to a pip.exe and the downloaded numpy wheel file