After reading the instructions, I have found that this is not at all a conventional click and go Mac app.

It's an open source effort, and therefore requires the user to jump through the usual hoops. There doesn't seem to be a lot of stuff to do to make it work, but it is certainly worth while being forewarned. (It appears to be a matter of putting a folder in the Library folder, and running a script.)

Also, the download link is for an older version of the application. Go to the creator's homepage to get the correct version.