What makes you think so? Screenshot?
You can download and evaluate FileBot without a license.
If FileBot does not launch after you have successfully installed FileBot and clicked on the FileBot icon, then more details are needed. Does it crash on startup with some error message? Does it run but open a window outside of the screen bounds where you cannot see it? The console output would likely provide such details.EDIT:
Are we talking about the Microsoft Store Edition by any chance? How do I restore my Microsoft Store or Mac App Store purchase?