I had repackaged it into a SketchupExtension archive.
I have them on my disk, but do not find that I’ve posted them here before. (Possibly at SketchUcation?)
Anyway, I RBZ packaged RubyZip versions 1.1.6 and 1.2.0, PM me if you would like one or both.
But generally we’ve discussed it in the past …
A little more on installing and catching errors for loading RubyZip here in …