This is required only for the Workers running the Jobtypes that are python controlled. If there are none that are used, then this is an optional install.
Typically, Linux and Mac OS X come with Python already installed. If not, RPMs should be available on the distribution CD or by download from the Internet. For Windows, free Python distributions can be downloaded from ActiveState at www.activestate.com. On Windows, Qube is compatible with Python versions 2.3 through 2.7.