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 LIsola del Viaggiatore Soc. Coop.:
Cagliari Guide is the innovative Cagliari travel guide for iPhone with over 200 points of interest, including monuments, museums, restaurants, bars, shops, craftsmens workshops, accommodation, festivals, parks, beaches and useful services. With Cagliari Guide you can take a stroll around the streets of the historic quarters to discover the centuries- old buildings and churches, the archaeological sites and the many panoramic views this stunning city has to offer. Available in Italian and English, the app is created by LIsola del Viaggiatore with the web platform maptoapp.com.