You are downloading the Gravity Line XAP file v126.96.36.199 for Windows Phone. Gravity Line is a free Platformer Game: GravityLine is designed for hardcore arcade fans. At first glance, it might seem easy, but don't be fooled. Avoiding the obstacles requires agility, thinking. You can now download the offline XAP package file to install & try it.
Download Locations for Gravity Line 188.8.131.52 XAP file
To try to install it manually from an SD card, you should choose one of the server location above to get the offline Gravity Line XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.