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 Steven Romej:
Calculess Free is a calculator for iPad. It can process nested expressions.See the whole expression as you type it. View your previous calculations and results above the current expression. The free version includes information about my other apps.A history view lets you look back over recent calculations.Tap any previous calculation to substitute it into the current expression.If you need to send yourself any results you can: easily export anything by email.A 2nd key flips some buttons over to expose even more functions.Evaluate complex expressions. Use parentheses liberally. The app will give you hints if you type something incorrect.Designed to feel similar to a TI-82 or TI-86 calculator.There is some extra room for more functions. Please contact me with things you'd find most useful.+ Turn keypress sounds on or off+ Pick a font you like for the buttons and display+ Email your calculation tape to yourself+ Adjust number formatting (scientific vs decimal)+ Enable display of the number grouping character (1,300.00 vs 1300.00)+ Built-in functions like avg(), trig functions, piSUPPORTContact me any time at slidetorock.com or email firstname.lastname@example.org