I'm going to go out on a limb here Neil and assume that Ten Tec did not respond to your requests. It says on the webpage that they are moving. Evidently, you will just have to wait until they are done moving, whenever that is.
I wouldn't hold my breath if I were you though, they don't seem to be showing any signs of life at all. I am also pretty certain this thread will get locked, you can discuss any radio or radio company on this site except Ten Tec. The site monitors close every thread that has anything to do with them, they seem to protect them like they are shareholders or something.
Hopefully, someone will have the file you are looking for to do the MARS mod, I wish you the best of luck, and I wish I could offer more help. 73 Neil, DE John.