LINKS FOR DOWNLOADING ARE PROVIDED IN THE INSTALLATION SECTION
Look under the subsections that correspond to your operating system.
Goto Sec. 2.2 for Windows, NT, XP etc. and Sec. 2.3 for Linux and UNIXEs in general.
Although the design and running the simulation of a PRT/GRT network appears
straight forward, you can save a lot of time reading at least
Sec 3!!.