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 Schneider Electric USA, Inc.:
The 16mm Visual Product Configurator is an interactive tool which simplifies the selection of Schneider Electric 16mm chrome and plastic push buttons, selector switches, pilot lights and available accessories for the US market. Users select an operator type, its available options (e.g. voltage and color) and add available accessories. The selected items are added to a parts list which contains links to each part number's detail page on our web site. The parts list can also be sent out via email.