You are downloading the PC Keyboard SMS AppX file v1.0.0.4 for Windows Phone. PC Keyboard SMS is a free and useful Social app: The Store App for Windows Phone PC Keyboard SMS can receive a message from an USB cable connection composed from his/her computer. The client ... You can now download the offline AppX file to install & try it.
Download Locations for PC Keyboard SMS 1.0.0.4 AppX file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline PC Keyboard SMS AppX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.