If you do not want to compile Rodi you can download binary files from
http://sourceforge.net/projects/larytet/. Use package 'Rodi'.
Unzip the archive and copy two JAR files in some directory, let's say \temp\rodi If you run Windows and Java2 Environment is installed simply click rodiTimple.jar file and then follow instructions in lesson 6 of the User Manual
If you use Linux command
java -jar rodiTimple.jar
should help and the same command can be executed from DOS command shell in Windows you can also try
javaw -jar rodiTimple.jar
start javaw -jar rodiTimple.jar