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 iTech Developers:
Simple Math for KidsEasier than ever, teach children learn simple math such as:(+) Addition(-) Subtraction(X) Multiplication(/) DivisionFeatures:* 3 levels of difficulty for each category.* Choose between 5, 10 or 15 questions per test.* With multimedia sounds.* Funny sounds and icon pictures pop up when the answer is correct.Look at the preview screenshots. Many children have learning problems in simple math, missing probably the most important knowledge they'll ever need.Save on tutoring! Be the best you can be!The best investment is education, order today!