GoogleCodeExporter mentioned this in 2 issues on Apr 6, 2015 pyglet won't install for python 3 #597 1.1.4 Windows installer msi: does not recognize installed Python 2.7 #622 ...

Apart from the step given in the guidelines, I had also added another field GDAL_VERSION with a value of 3.0.4 in the environment variable. Installation of rasterio: I am using Python 3.7.4 (64-bit).