You are downloading the Walkmap AppX file v1.0.0.1 for Windows Phone. Walkmap is a free Travel App: This app track the movement of phone, it update the current position every 15 minutes (Windows 10 Mobile) or 30 minutes (Windows Phone 8.1). This can be used. You can now download the offline AppX package file to install & try it.
Download Locations for Walkmap 1.0.0.1 AppX file
Package File
Please Click Here > to retrieve available package files for Walkmap.
Please be aware that the Walkmap AppX file you are to download is hosted on the Microsoft Store CDN server. You can read more about Walkmap or get it on Microsoft Store.
To try to install it manually from an SD card, you should choose one of the server location above to get the offline Walkmap AppX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.