You are downloading the Headtrackr XAP file v2017.311.0.0 for Windows Phone. Headtrackr is a free and useful Productivity app: Head tracking via your phone’s compass and gyroscope.Transfer your head movements to the game you are playing on your PC in real time, via the ... You can now download the offline XAP file to install & try it.
Download Locations for Headtrackr 2017.311.0.0 XAP file
Important Notice: Now Due To Unspecified Limitations, You Can Not Use The Offline XAP 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 Headtrackr XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.