[Zope] Zope API Help System not working?

I am a newbie to Zope/Plone. I am trying to view the Zope API via the Help System in the ZMI, but I get prompted to login and my admin login does not work. I'm pretty sure I downloaded the latest version of plone which I was led to believe would have the latest version of zope & python: Zope Version (unreleased version, python 2.3.3, win32) Python Version 2.3.3 (#51, Dec 18 2003, 20:22:39) [MSC v.1200 32 bit (Intel)] System Platform win32 If I do not have the latest version of zope for my plone instance, how can i upgrade? Thanks for any help, Ed.