The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
From Appximus Company Limited:
Viewing chords, changing chords, remembering chords GuitarSensei can do more than that! This app is made for BOTH RIGHT HANDED or LEFT HANDED guitar players. In this special app, 1. You can COMPOSE you own song 2. Then add how many times you want to play each chord. 3. Press START and the chord will animate while you are playing. 4. You can also view all the chords, each chord, or chord by Major/Minor key. Practice those difficult sets of chord you created. Write a song, memo it, play it with friends. Never worried about forgetting which chords to play again.