You are downloading the Calculus Test XAP file v126.96.36.199 for Windows Phone. Calculus Test is a free and useful Education app: MindBrainer presents: Test yourself on Calculus! Train your brain, make yourself awesome "human ... You can now download the offline XAP file to install & try it.
Download Locations for Calculus Test 188.8.131.52 XAP file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Calculus Test XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.