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 Moa Creative:
CEMIX is a tried and trusted brand and has been manufacturing construction products in New Zealand for over 25 years. Today CEMIX is the largest bagged concrete and mortar manufacturer in New Zealand. * Concrete Calculator This app features calculator that allows builders to calculate their concrete requirements based on the volume of a slab. * DIY Guide A built in DIY guide to allow you to allow builders to perform basic building tasks like - Laying a concrete slab - Erecting a post in concrete - Build a retaining wall - Build a stone wall - Build a BBQ - Laying blocks or bricks - Laying a brick paving for patios, paths, driveways