You are downloading the Package Tracker XAP file v18.104.22.168 for Windows Phone. Package Tracker is a paid and useful Productivity app: Package Tracker is a tool for tracking the delivery status of packages on your Windows 8 and Windows Phone devices and supports over 60 carriers. ... You can now download the offline XAP file to install & try it.
Download Locations for Package Tracker 22.214.171.124 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 Package Tracker XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.