Select and download the appropriate package. Include the jar in your classpath. If you have selected the 1.3 version, be sure to download and install log4j (version 1.2.8 has been tested, but I'm sure others will work as well) and uncomment and update the "log4j.jar" property in jbeantester.properties to reflect its location on your system.
If you prefer to build the binary yourself, be sure to install ANT (1.5.4 has been tested, but others should work). Then download the zip file and unzip it and run "ant dist1.X" (where "X" is the jdk version you wish to target).