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 All Pro Apps Corporation:
Bass Play is incredibly powerful and one of the most intense music apps availableIf you already play Bass this is a great practice tool, if not, it's a fun way to learn!A vast array of options lets you customize Bass Play to your own preferencesBuilt in Metronome to add beats and help your timingTouch screen functionality allows you to strum your Bass like a proAmazing graphics and sound quality to create life like musical piecesImpress your friends and family with your Bass playing abilities right on your iPhonePlease be sure check out our other apps in the iTunes App Store