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 Ankur G Patel:
Bring back the art of writing on a sticky note and posting it on the wall. Sketch, draw or jot down notes on a sticky note and share it with yourself or your friends via Facebook, Twitter, Tumblr or e-mail, or save it on your device for later viewing.iNote is also designed to run on the iPad. Now you can enjoy sketching notes on the big screen.