You are downloading the Smart Cart AppX file v126.96.36.199 for Windows Phone. Smart Cart is a free and useful Lifestyle app: Smart Cart is a simple, beautiful and smart shopping list app that helps you find the fastest way to get through the store and pick up all the items ... You can now download the offline AppX file to install & try it.
Download Locations for Smart Cart 188.8.131.52 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 Smart Cart AppX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.