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 Wai Lun Kam:
When something bad happens or you have feeling of restlessness or being depressed, open the apps and touch the screen, reciting a spell of "touch wood". It might happen that tree's spirts bring you peace of mind.