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 Harmony Software UK:
This application for customers whom already buying Gama Ltd products from company or who would like check their product and make order from ipad easily.So, Basically when you download this application also you need to download latest product information and updated catalogue images from the company's server.After that you could check all catalogue pages and if you need you could easily create your order by just touching double to any product. When you add order details you will see ordered quantity for each item. So, you could update order quantity from that field.When you finish your order you could send e-mail to Gama UK ltd from summary pages in this application.Note: if you would like to have this type of catalogue for your company we could help you to put your catalogue details inside of this application.(Please send us e-mail about that)