Once you have installed/built the sasktran code you can install the sasktran python package. Download the wheel file from http://odin-osiris.usask.ca/?q=node/450
open up a command window and run
$ pip install sasktranif-4.0.0-cp34-none-win_amd64.whl
You should now have access to the sasktranif package. This includes the radiative transfer model, climatologies, ISKGeodetic, and a few other tools. However, the retrieval code does not come with this package. For that you will need to download the repos_skpython repository. See instructions at http://odin-osiris.usask.ca/?q=node/423 for how to access the svn server.