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
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 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.