You must have an installed JKD, preferred v.1.7+, and also a set environment variable to its bin folder for being able to compile and execute the Netspy via the batch files, because they are using javac and java commands.

Once you are set up, compile the source code by starting the compile.bat, afterwards start the execute.bat for running the application.

Initially there should be no config.properties inside the resources folder. The path configuration of inbox, quarantine, log and blacklist is generated with a default value set within a fresh config.properties. So if you run into any kind of problems, make sure you do not have it