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 NECTEC:
(Ya&You) ( .) () http://www.yaandyou.net/Ya&You: It is the application for searching and providing the knowledge ofmedicine and health information to promote the use of drugs and healthcareproperly. This application is carried out to the public by PharmaceuticalResearch and Development Foundation (PhaRed) and National Electronics andComputer Technology Center (NECTEC). With this application, the public will haveaccess to medicine and health information quickly and easily, and the result isshown in Thai and easy to understand (lay language). In addition, the medicalpersonnels can use the data from Ya&You to assist in communicating withpatients as well. To visit the full version of Ya&You system, you may visit athttp://www.yaandyou.net/
