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 Play Music Publishing:
Discover, thanks to the How2Play application, multimedia guitar, piano, bass guitar and drum courses containing musical scores, video and audio recordings and backing tracks ... Utilize the application also for downloading your own courses and enjoy an experience all its own ...
