Free Download RedCritter Teacher 2.5.1.0 XAP for Windows Phone
Free Education App by RedCritter

You are downloading the RedCritter Teacher XAP file v2.5.1.0 for Windows Phone. RedCritter Teacher is a free and useful Education app: This app requires a subscription with www.redcritterteacher.com (free 30 day trial no credit card required).Use your Windows Phone to ... You can now download the offline XAP file to install & try it.
Download Locations for RedCritter Teacher 2.5.1.0 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 RedCritter Teacher XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.