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 IBlue piscine:
Take a picture of the place you would like to have the I Blue swimming pool and you will become an expert designer. Choose a perspective, change the shape and the dimension of the swimming pool. Improve the performance with controlling the colour and the light, in order to obtain the perfect photomontage. Now you can make jalous your friends sharing your new swimming pool.You can also ask for more information about the pool you choose, sending an e-mail with all the requests thanks to the specific button.