For your convenience, I have found the websites with the downloads you need to install this game completly free of charge!
Download Tribes free from Sierra themselves!
Then download the RPG update which can be found at www.sinbot.net or...
The file is called RPG mod... follow its install instructions correctly and BOOM! you can connect to Sinister's Wasteland immediatly and start your character. Needless to say there are many other RPG servers, such as Partciles PCRPG server, which deserves much credit for being th leading RPG server for many years.
-LongBow
