To get started, click the green 'code' button and download zip. Texture Explorer requires the free Max 8 runtime enviroment. Download Max 8 at http://cycling74.com
Documentation is linked from wiki page or can be accessed here https://docs.google.com/document/d/1UagwWQTEFbbRgR_VttJC6FQHhsPspMN-McS8-eQLiuE/edit?usp=sharing