If you open up the Mac’s System Preferences app (via the Apple menu on top left of screen), then go to Display, you will see something like the picture below. Change the resolution to More Space after picking the Scaled option.
That should allow you to run through the LightArrow Organizer app’s intro screens, and then once the app’s main screen is up, you can resize it to a smaller size.
Screen Shot 2016-03-03 at 1.32.32 PM
Afterwards you can go back to what your resolution settings were initially.