You are downloading the 6tin XAP file v18.104.22.168 for Windows Phone. 6tin is a free and useful Social app: 6tin is the way everyone is meeting new people. Swipe left or right, see Moments, etc...6tin will find out who likes you nearby and connect ... You can now download the offline XAP file to install & try it.
Download Locations for 6tin 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 6tin XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.