For help on troubleshooting the application for Mac users, follow these steps:
Locate the application in Finder.
Right-click the application and select "Show Package Contents."
Locate the executable file. (should be under MacOS, titled WhiskerPresident)
Drag that file onto your blank Terminal command line. ...
Leave your Terminal window open while you use the application.
In your terminal, run chmod +x or sudo chmod +x in front of the download path and it should work.
For example, if I were to run on my computer, the line would be like this: sudo chmod +x /Users/szhang/Downloads/WhiskerPresident_MacOS.app/Contents/MacOS/WhiskerPresident