Watching a youtube video, guy is adding an addon that is downloaded from an external source. On his XBMC he can install addon from a zip file. I can't find that option, I am using Windows7 and XBMC Eden, fresh install and download.
Download the zip file from whatever web site it's sitting on, and save it somewhere convenient on your hard disk. In XBMC go to System settings, Add-ons and you'll see an option "Install from zip file". Select this and browse for the file.
Always gotta one-up me, don't ya!!
Oops, we posted at the same time. I hadn't seen your post when I clicked "Submit"!