Just downloaded the latest 4.x install (file name front-4.7.x-4.0.tar.gz) and noticed the README.txt file states only for 5.x:
$Id: README.txt,v 1.24 2007/01/22 19:44:27 jasonm3m Exp $
This module is intended for Drupal Version 5.0
It will not work with earlier versions.
I'm guessing it's just a typo, but will report back if the module doesn't in fact work with my 4.7.x site.