The page covers the integration with iStep by Hoax Games
iStep is a premium foot placement solution for Unity that will help bring your characters to life and provide that triple-A feel everyone is looking for.
You can find more information about iStep, and its documentation and also purchase it over on the Unity Asset Store.
Integrating iStep with Game Kit Controller is fairly simple!
Import iStep into your project.
Disable the Foot IK Component in Other Systems.
Navigate to and click on the Player Controller game object.
Add the iStep Foot IK script.