The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From StarDevs Ltd:
Selecting the right color, coloring all the shapes, and checking whether everything came out as a young artist intended is not an easy task. He or she will have to be patient and attentive. Animated characters will make any restless artist keep trying. Coloring them is much more entertaining.