I can confirm that results can be obtained from using much of the software offered in the plugin while using ZC 1.5.5/1.5.5.a, but I was provided a site that had already tried to install it and had some difficulty in operation. Which means I did not start with a fresh download of the plugin, but instead resolving the issues before me.
Anyways, after correcting html validation issues (apparently extreme) the plugin does what it should, though I'm finding that I have an additional onchange event to be executes, but it gets overwritten, etc... so have to javascript my way to what I want/need.but it does work.
Bookmarks