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 Sangmin Sim:
QRS+Generating and Scanning QR Code.Fast and easy and useful!Feature.1. You can make your own QR Code with your website URL easily. - Saving QR Code to Album. - Sending Email with QR Code. - Add to favorites2. Generating QR Code with current website what you see now. - QRS+ recognize current page's URL and make QR Code automatically. 3. Scanning QR Code. - Just scan QR Code and It'll automatically take you to a webpage.4. History Management. - Generating history - Scanning history.This app. uses the ZBar Barcode Reader project licensed under LGPL 2.1 license. More information on use of this opensource project and license requirements can be found at http://www.pdablog.com/qrs/lgpl