You are downloading the Grandpa XAP file v22.214.171.124 for Windows Phone. Grandpa is a free and fun Family game: "Highly characteristic and incredibly entertaining, Grandpa and the Zombies offers a host of enjoyable levels that will delight players of all ages." ... You can now download the offline XAP file to install & try it.
Download Locations for Grandpa 126.96.36.199 XAP file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Grandpa XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.