Last updated on February 2, 2016
@binarykitten (on Twitter) had the question I officially give up.. how the hell do you download only 1 component of the Zend Framework? I’ve been looking all over the site and I told her that I wasn’t aware of a method, that there were potential dependencies and to maybe try asking @calevans. He responded with the link http://epic.codeutopia.net/pack/ which appears to be a packager for the PHP Zend Framework versions 1.6 and 1.7 developed by Jani Hartikainen (@jhartikainen).
So, yes, it is possible to (unofficially) download parts of the Zend Framework and not have to worry about dependences.