You are downloading the Radiant APPX file v22.214.171.124 for Windows Phone. Radiant is a paid Shooter Game: "Hexage does an incredible job of reinventing the game that took the world by storm." - App-Reciation Reviews Cut through hundreds of. You can now download the offline APPX package file to install & try it.
Download Locations for Radiant 126.96.36.199 APPX file
To try to install it manually from an SD card, you should choose one of the server location above to get the offline Radiant APPX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.