You are downloading the Pocket File Manager XAP file v188.8.131.52 for Windows Phone. Pocket File Manager is a paid and useful Productivity app: The best File Manager with full access to phone and SD Card! !!! To add SD card and other folders tap on "+" button and select ... You can now download the offline XAP file to install & try it.
Download Locations for Pocket File Manager 184.108.40.206 XAP file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Pocket File Manager XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.