Just pick up Junes issue of Computer Gaming World and they are on the CD along with the 1.11 patch for Tribes 1.
Also if you happen to get these games you will most assuredly want the Presto Pack, New Options, and Dox maps for Tribes 1. (Poop pack 1.02 is the best to get all the better scripts.)
Tribes 2 is ok as is but you can pick up many extras from
www.tribalwar.com or
www.Planettribes.com Both have extensive file archieves.