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 Chen Shun:
This app make group message so easy! Group Manager: - Send Group SMS / iMessage. - Send Group Email. - Save your own Groups. Find By Common Field: - Find contacts with the same Birthday Date / Month. - Find contacts with the same Creation Date. - Find contacts with the same Company Name. - Find contacts with the same Job Title. - Find contacts with the same Email Domain Note: - Group SMS to non iOS devices requires to disable: iMessage, MMS & Group Messaging in Settings application.