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 stadjer.net software:
CrewApp is an app that will show and export roster and aircraft information and will available as a universal app.It consist of 7 separate screens that will show the following information:Roster information retrieved from Crew Web PortalAircraft information retrieved from Aircraft Movement ControlDaily allowance information calculated with given or adjusted informationNext Duty information with an export to Log Ten Pro optionDocument viewer to read OFP, Loadsheet and/or GenDecUsers section to update users.About section to show these pages.CrewApp MP is the pro version and includes the Per Diem module.