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 La Feve System:
"Ittou Gai !" is an application which only inputs the easy housing information on profit real estate, and loan information, and conducts analysis of the income and outgo of a profit housing from various angles, such as cash flow and accounts profit and loss.