You are downloading the Student Chemistry AppX file v220.127.116.11 for Windows Phone. Student Chemistry is a free and useful Education app: Made by a former student, for students; this app provides the tools necessary for use in the chemistry classroom. It currently includes: A full ... You can now download the offline AppX file to install & try it.
Download Locations for Student Chemistry 18.104.22.168 AppX file
Important Notice: Now Due To Unspecified Limitations, You Can Not Use The Offline AppX 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 Student Chemistry AppX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.