You are downloading the Navistools AppX file v220.127.116.11 for Windows Phone. Navistools is a free and useful Business app: Navistools Field construction field management software combines mobile technologies for on-site use with server based collaboration and reporting. ... You can now download the offline AppX file to install & try it.
Download Locations for Navistools 18.104.22.168 AppX file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Navistools AppX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.