You are downloading the Mathologica XAP file v18.104.22.168 for Windows Phone. Mathologica is a free and useful Education app: Mathologica is a free math solving program that shows work and detailed explanations completely for free. From basic algebra to calculus Mathologica ... You can now download the offline XAP file to install & try it.
Download Locations for Mathologica 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 Mathologica XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.