[Zope] Upgrade Five for Zope 2.9.7?

How do I upgrade Five (http://codespeak.net/z3/five/) from v1.3.8 to v1.4.4 in Zope v2.9.7? The Plone product I wish to install (Reflecto v1.2 - http://plone.org/products/reflecto) apparentl. requires v1.4.1+. Frustratingly, the installation page (http://codespeak.net/z3/five/INSTALL.html) and INSTALL.txt file for Five do not actually explain how to install it. Many thanks. James