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 Wonderland Labs:
The big day is coming and you are counting minutes. Why don't you count it with your friends and family. Countdown tells you the remaining days, hours , minutes and even seconds to your special occasion. You can choose or upload a background image , name the event, write a message with any color and share it with your friends and family via instagram, facebook, twitter or email.It is all free !!!