You are downloading the Math Formulas XAP file v126.96.36.199 for Windows Phone. Math Formulas is a free and useful Education app: V2.0.0-------Added matrix formulas, UI changesV1.0.0-------Algebra, Geometry, Trigonometry, Calculus, Statistics Formulas. ... You can now download the offline XAP file to install & try it.
Download Locations for Math Formulas 188.8.131.52 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 Math Formulas XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.