You'll have to compile the code yourself to be able to run it on macOS, my released binaries are only for Linux since I want to encourage users to run it on a live Linux and offline.
The readme file of the project has the required information for building: https://github.com/Coding-Enthusiast/FinderOuter#build-from-source-code
If you have Visual Studio, all you need to do is to open the .sln file and then build.

Please post your additional questions in the project's announcement (https://bitcointalk.org/index.php?topic=5214021.0) or open an issue on GitHub. Let's not hijack this topic anymore.