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 ScottSykora.com:
Filo is a a simple app for dropbox. It lets you zip and attach files to emails, print almost any file using AirPrint and use "open with" to open files easily in other apps.
Filo for Dropbox for iPhone
