You are downloading the Update Central AppX file v188.8.131.52 for Windows Phone. Update Central is a free and useful Productivity app: Read through Windows Phone update change logs and future update rumors. Windows 8.1, Windows 10, and more with information on specific build numbers ... You can now download the offline AppX file to install & try it.
Download Locations for Update Central 184.108.40.206 AppX file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Update Central AppX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.