The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Computer Perfect - Lightning Online Point of Sale:
Lightning Online Point of Sale for the iPad is a back office management tool. When used in conjunction with Lightning Online Point of Sale, a subscription based product, you can manage inventory, customers, vendors, employees, security, sales reports, closeout data and much more. In real time, of course.See more at http://www.computerperfect.com/ipad.html***Reminder: You must be a subscriber of Lightning Online Point of Sale to use this application. ***