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 MarketVision Research:
If you are currently a member of a MarketVision Research Community, you can use this app for mobile optimized participation in your community. The website for MVR Community is https://www.mvrcommunity.com.