You are downloading the TextBelter AppX file v126.96.36.199 for Windows Phone. TextBelter is a free and useful Productivity app: Send SMS text messages for free, without requiring any registration, nor entering any CAPTCHA code. There are some but minimal limits on the number ... You can now download the offline AppX file to install & try it.
Download Locations for TextBelter 188.8.131.52 AppX file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline TextBelter AppX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.