The Download Now link directs you to the Windows Store, where you can continue the download process. You must have an active Microsoft account to download the application. This download may not be available in some countries.
From Marcos Tanaka:
What's new in version 2.0: Completely redesigned interface, making the application easier to use. Now you can send the results of calculations via email. Added support to Windows Phone 8. Better support to all kinds of Windows Phone devices (screen resolution) Use this application to calculate descriptive measures of a data set. Descriptive measures supported: Mean. Median. Range. Median Absolute Deviation. Variance (sample). Standart Deviation (sample). Coefficient of Variation.