Continuously built downloads are in /current.

Doc/tools/sphinxext/download.html

 {% extends "layout.html" %}
 {% set title = 'Download' %}
-{% set dlbase = 'http://docs.python.org/ftp/python/doc/' + release %}
+{% set dlbase = 'http://docs.python.org/ftp/python/doc/current' %}
 {% block body %}
 
 <h1>Download Python {{ release }} Documentation</h1>