You are downloading the Planker XAP file v18.104.22.168 for Windows Phone. Planker is a free Health & Fitness App: Planker is a very simple app that tracks your planking exercises. The app walks you through sets of 3 positions which include left, right and forward planks. . You can now download the offline XAP package file to install & try it.
Download Locations for Planker 22.214.171.124 XAP file
To try to install it manually from an SD card, you should choose one of the server location above to get the offline Planker XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.