[Zope] Upgrade Five for Zope 2.9.7?

[James Robertson]

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