Sorry for a late response. I was able to find the Glow Ibex theme, and the TechniX (which has 3 versions, so I'll skip that one for now ). I will check it out to see if it is working on one of my systems.
Meanwhile (no, not back at the ranch
) , you could try creating a .themes directory inside of your user account's /home , and extract the themes in question there. Try themes and see if they work from that point.
This theme does not work on my system either. It's also not exactly an XFCE theme, but it is a GTK theme. Unfortunately I could not find any information leading towards what version of GTK it is compatible with (perhaps the author does).