You are downloading the HTML Pro XAP file v18.104.22.168 for Windows Phone. HTML Pro is a free Education App: This HTML editor tries to make text editing on your phone more efficient and productive. We have introduced smart buttons which will help you to add some. You can now download the offline XAP package file to install & try it.
Download Locations for HTML Pro 22.214.171.124 XAP file
To try to install it manually from an SD card, you should choose one of the server location above to get the offline HTML Pro XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.