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 Azio Electronics.:
UniQR is the most user friendly, fast, and high accuracy QR code scanner APP. You may have the following steps or action depends on the QR code you scanned. Email will let you send the mail in the UniQR. SMS will let you send the text without retype the phone number and text content. meCard and vCard will let you add, text, face time to the contact. Other formets such as URL links, Phone Number, TEXT are also supported. The history list records your scanned list, and you may press HEART button as your favorite and will never get deleted if you need a QR scanner in your iPhone as built-in APP, UniQR is your best choice for sure.