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.
Altitude Sickness Detector is used to detect riskiness of getting Altitude Sickness (i.e. AMS). A warning will be prompted if user is in high altitude (>=1500m). Further clinical test and useful medical suggestions will be provided. Wish you all the best, keep safe and enjoy climbing! Please consult doctors before going to high altitude landscape.