The application is an 'executable jar', which means it should run as-is if a Java Runtime Environment is installed.
Simply download the multiphase-metronome-0.4.jar file and either double-click or right-click & 'open-with' the Java launcher.
NOTE: The file extension might be changed to '.zip' by your browser or security software. If you are comfortable the metronome is not dangerous, simply change it back to '.jar'.
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