You are downloading the Horizon XAP file v220.127.116.11 for Windows Phone. Horizon is a free and fun Educational game: "Dawn of Math: horizon" is an engaging game with only numbers. You will have to continuously and consistently split the numbers into 2 groups ... You can now download the offline XAP file to install & try it.
Download Locations for Horizon 18.104.22.168 XAP file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Horizon XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.