GoPro cameras normally operate as a Wifi host with a fixed IP address of 10.5.5.9. This utility is designed to allow the user to change the IP address of each camera in a multiple networked camera installation. If you don't know why you would need to do this, you don't need this utility.
The IP Address Changer only works with the HERO3+ Black camera and absolutely requires firmware version HD3.11.01.04 and Wifi version 220.127.116.11, released October 15, 2013. No older or newer firmware will work with this utility.