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 Programming Thomas:
Keep Calm Creator allows you to create custom Keep Calm and Carry On posters. You can easily change the text, crown and background - simply tap on the part of the poster that you want to edit.There are loads of options for customization: font, text color, crown, crown color, emoji crown, shadow, background color, background gradient and background image (some features require in-app purchase). Sharing from the app is also really easy - it takes just one tap to get your poster on Facebook, Twitter or Instagram.Keep Calm Creator has several exclusive features; all your posters are saved within the app so that you can go back and edit them later. You can also use an unlimited number of lines of text with full control over which lines appear smaller.A selection of alternative photo backgrounds and over 1000 crowns can be purchased within the app.If you want to print your posters or use them commercially, Keep Calm Creator supports PDF export, which produces posters suitable for printing at any scale. Additionally, many of the alternative crowns included in the app are vectors, so they'll look great at any size.