You are downloading the ShareSync XAP file v0.12.0.0 for Windows Phone. ShareSync is a free and useful Business app: ShareSync is a secure, business-grade file sync and share service. With ShareSync, your files and folders are always in sync across your desktop, ... You can now download the offline XAP file to install & try it.
Download Locations for ShareSync 0.12.0.0 XAP file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline ShareSync XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.