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.
Check the balance of your Shanghai Public Transportation Card. Brought to you by ExploreMetro, creators of the 'Explore Shanghai metro map' app. Note: it may take 24-48 hours after a transaction before the updated balance appears in the app.