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 Tanvir Ahmed:
Convert between decimals and fractions quickly and easily with Frac Factory! Simply enter a decimal value into the app and hit convert, and the app will convert your decimal into a fraction for you. You can also input fractions into the app (either as mixed numbers, irregular fractions, or regular fractions) and the app will convert your fractions into decimals.This app is a quick and easy to use tool for those who need a lightweight tool to convert to and from fractional values.