Very strange! Which file did you download? I belive they are all lua files for each of the operating systems. Just need to place it in your scripts folder to use :)
Oh you don't need to compile the tool/script in to Aseprite just needs to but put in the scripts folder that comes with Aseprite is all. (Asuming that your compiling aseprite in the image you sent? Along as you have a good build and it generated the folder)
Just download then drag and drop the script in to the folder in and restart aseprite and it should appear in the scripts menu option 😀