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 Pencil Busters:
Rocket Tracker is an app used to keep track of the rocketeer's collection of model and high-power pockets. It can be used to keep track of a rocket's physical characteristics (height, weight, center of gravity, etc.), what engines it can use, when it has been launched and what engines where used for that launch, and what repairs it may need.In addition, Rocket Tracker keeps a list of all engines used by any of your rockets and will list all of your rockets that can use a given engine. This is especially helpful when you have a couple of engines laying around and want to know which of your rockets could use those engines.Start using Rocket Tracker today to organize and keep track of all your rockets!NOTE:We recommend using only one device to track all of your rockets for now. We plan on providing syncing between all your devices soon.COMING SOON:- Synchronization between all of your devices!- Twitter integration for launches!- And much more!