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 Ricoh Co., Ltd.:
GR WORLD is an application that enables you to view photographs taken using the Ricoh GR DIGITAL compact camera and put up for public viewing on Flickr. What kind of scenes and moments are GR users throughout the world capturing at this very instant? And wouldnt it be cool to be able to see those pictures anytime and anywhere? It is the very reason why the GR WORLD application was developed. Discover beautiful, moving photographs, valuable records of past eras, breathtaking artistic shots, and everything in between. We hope that you will become inspired by these pictures to enjoy and take more photographs yourself! View the photographs as a slide show or browse through separate genres. You can also register photographs you like in your favorites and look through them all together. We hope that not just GR users, but also anyone who has an interest in photography will enjoy using this application.