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 Astrodantastic Software:
ArXivReader is an iOS interface to the ArXiv.org pre-print server, allowing you to easily browse and save recently submitted papers in all ArXiv categories. ArXivReader also features a comprehensive search utility, allowing you to search the entire ArXiv.org site for past papers.Additional Features Include:- Save PDF files directly to the your device for offline reading. - Flip view that lets you save notes on individual papers- Subcategory filters that let you sort through recently submitted papers.- New multi-threading capability lets you continue to browse the ArXiv.org feed while downloading papers- Email the PDF files and your associated notes without leaving the application- View papers in portrait and landscape modes
- Native iPad support- Export to iBooks- Export to any PDF capable app- iTunes file sharing support- Menu bar now slides away while in PDF view- Database backup now possible via iTunes file sharing- Bug fixes