You are downloading the MolarMass XAP file v188.8.131.52 for Windows Phone. MolarMass is a free and useful Education app: Enter a chemical formula and this app will give you its molar mass!Updates in version 1.1.1Advertising ... You can now download the offline XAP file to install & try it.
Download Locations for MolarMass 184.108.40.206 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 MolarMass XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.