At: https://pypi.python.org/pypi/setuptools

Installation Instructions

The recommended way to bootstrap setuptools on any system is to download ez_setup.py and run it using the target Python environment. Different operating systems have different recommended techniques to accomplish this basic routine, so below are some examples to get you started.

Setuptools requires Python 2.6 or later. To install setuptools on Python 2.4 or Python 2.5, use the bootstrap script for Setuptools 1.x.

The link provided to ez_setup.py is a bookmark to bootstrap script for the latest known stable release.
