plextor TV402U

I loaded the eyetv software for the plextor TV402U onto my ibook and my dad's pb and several months later I tired to load it onto my imac, but realized that I had lost the activation key. I was wondering if anyone could hook me up with an activation key for eyetv running on a plextor TV402U. I realize that you will probably think that I am trying to pirate the software, but it was legitimately acquired; I purchased it at the last Macworld.