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 Apps-Factory FZ LLC:
Story Hunter the App for Viennese and Vienna visitors who want to see more than the typical tourist spots and always the same boring places. Separated into various routes, Story Hunter offers a range of hitherto hardly known but very special places, which are definitely worth discovering. You can also use Story Hunter as your offline City Map guide and look for public facilities like public toilets or WIFI-Hotspots. Disclaimer: Continuous use of GPS running in the background can dramatically decrease battery life.