You may want to try Requiem 1.8.16 instead (or at least 1.8.13, 1.8.12)

You'll need to install Java if you want to use the the Java GUI that is included. The GUI can be used on both Windows and Mac platforms.
Just double click on the Requiem.jar file and the GUI will come up.

For Mac users, it is easier to use the RequiemDroplet.app because of the Drag & Drop feature.