Perhaps my email from the 22nd didn't make it to you. See the downloads page at code.google.com/p/pythonxy/wiki/Downloads rather than following the link on the main page.
Py(x,y)-2.7.3.1.exe is an update file listed under UPDATES a few paragraphs from the top of the download page. This is a 117 MB update, that does require 2.7.3.0. However, at the top of that same page, listed under CURRENT RELEASE, are links to Python(x,y)-2.7.3.1.exe (3 different mirror locations, actually). This file is over 500 MB in size and is the complete distribution.
Jim