Rainbowduino library

I downloaded the zip file for the rainbowduino it does not show up in sketches add library?

Downloading is not enough. You have to install the library and restart the ide. This sometimes fails especially if the library folder is in a subfolder in the zip file. In this case, unzip the folder yourself. You have 2 options here, the libraries folder of the arduino installation or the library folder of your sketchbook