You are downloading the Surfy Pro XAP file v18.104.22.168 for Windows Phone. Surfy Pro is a paid and useful Utilities & Tools app: #1 Browser for Windows Phone 8.1 Surfy is the most intuitive, feature rich and fantastically simple web browser in the WP store. "...Better ... You can now download the offline XAP file to install & try it.
Download Locations for Surfy Pro 22.214.171.124 XAP file
Important Notice: Now Due To Unspecified Limitations, You Can Not Use The Offline XAP File To Install It Any More.
To try to install it manually from an SD card, you should choose one of the server location above to get the offline Surfy Pro XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.