Create a directory \ray\ in the root of your hard disk,
use 'arj x [name].arj' to extract the following files in this new directory
gum.arj, pov_dir.arj, ply_dir.arj and r_dir.arj

The topic 'Installation' in the file gum.hlp in \ray\gum\ will guide you 
through the rest of the installation procedure.