You are downloading the FB2015 XAP file v18.104.22.168 for Windows Phone. FB2015 is a free and useful Social app: FB 2015 allows you to connect with most popular social networking site Facebook. so now keeping up with friends is faster than ever. See what friends ... You can now download the offline XAP file to install & try it.
Download Locations for FB2015 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 FB2015 XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.