You are downloading the PDF Reader XAP file v18.104.22.168 for Windows Phone. PDF Reader is a free and useful Productivity app: PDF Reader is a free app for viewing and interacting with PDF documents on Windows Phone 8. This app supports a wide variety of PDF file ... You can now download the offline XAP file to install & try it.
Download Locations for PDF Reader 22.214.171.124 XAP file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline PDF Reader XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.