The outline of EGS5 code is described. History, scope (energy range and particle) of the simulation, major application of the code is mentioned. Physical processes in EGS5 code are described. Procedure to set up of input file and user code for new calculation is explained.
I'm not sure if you would have to install any additional software or not but EGS5 may have dependencies that if your running Linux would have to be satisfied first.
These instructions look like for running on a Windows system.