You are downloading the Ruby On Rails XAP file v126.96.36.199 for Windows Phone. Ruby On Rails is a free Books & Reference App: ★ ★ ★ ★ ★ WAGmob: Over One million Paying Customers from 175+ Countries. ★ ★ ★ ★ ★WAGmob brings you simpleNeasy, on-the-go learning app. You can now download the offline XAP package file to install & try it.
Download Locations for Ruby On Rails 188.8.131.52 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 Ruby On Rails XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.