The whole system is written in JAVA® and packed as a JAR-file.
(JAVA is a trademark of Sun Microsystems, Inc., USA.)
You therefore need a JRE (Java Runtime Environment, version (1.)6 or later) (You will find it free of charge on the internet.)
You will find the JRE at
http://java.com
resp. as update for the Mac at
http://developer.apple.com/java/download/
The program is portable, 'cause it's written in Java®, it should run on all well-established systems (PC, Mac, Linux usw.); specific system requirements don't exist.
First the program is copied – preferably to a directory (folder) of its own.
The program is started as usual, e.g. by doube-click on its icon.