The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Thomson Reuters:
The Checkpoint Pocket Assistant brings the quick reference information you need right to your finger tips. Key Federal Tax Rates are immediately available on your iPhone. Learn about additional quick reference utilities, tables and rates, or calculators as they become available either free of charge or for a nominal fee. Created by the same team who brings you Checkpoint, Thomson Reuters award winning online research platform, the Checkpoint Pocket Assistant provides the apps you need to be more effective and efficient when youre on the go.