You are downloading the Graphical Calculator XAP file v18.104.22.168 for Windows Phone. Graphical Calculator is a free Education App: Update - - Added User guide - Fixed minor bugsGraphical Calculator performs all sort of calculations on complex numbers, fraction and decimal. You can now download the offline XAP package file to install & try it.
Download Locations for Graphical Calculator 22.214.171.124 XAP file
To try to install it manually from an SD card, you should choose one of the server location above to get the offline Graphical Calculator XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.