You can either install using Git or direct Download. From command line:
# Clone this repository
$ git clone https://github.com/relativty/wrmhl
Upload to the Arduino the following program:
Go to Edit -> Project Settings -> Player, and under "Other Settings" find an option that reads "Api Compatibility Level" and change it from ".NET 2.0 Subset" to ".NET 2.0".
Select Assets/WRMHL/DemoScenes and choose the demo of your choice !