This plugin was made open source to help in development and bug fixes by accepting pull requests from the community. Anyone is free to compile this plugin and use it.
If you need support for this plugin you must purchase it from SigotMC or BuiltByBit
To build this plugin you need to add the missing APIs to the /libs/ folder then it's as simple as typing
./gradlew shadowJar
Here is a list of the various libraries used in this plugin.