You are downloading the Pitcairn AppX file v22.214.171.124 for Windows Phone. Pitcairn is a free and useful Education app: Take a journey through a 19th century village and try to earn 200 points in order to launch the Pitcairn Missionary boat and earn a Pathfinder honor ... You can now download the offline AppX file to install & try it.
Download Locations for Pitcairn 126.96.36.199 AppX file
Important Notice: Now Due To Unspecified Limitations, You Can Not Use The Offline AppX 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 Pitcairn AppX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.