You are downloading the Just a Ball XAP file v0.0.2.1 for Windows Phone. Just a Ball is a free and useful Kids & Family app: It's just a ball, which controlled by accelerometer.And now ball is bouncing! ... You can now download the offline XAP file to install & try it.
Download Locations for Just a Ball 0.0.2.1 XAP file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Just a Ball XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.