You are downloading the FretboardMaster XAP file v22.214.171.124 for Windows Phone. FretboardMaster is a free and useful Education app: Do you want to learn all notes in your bass or guitar fretboard? Achieve it! This App shows a fretboard of your instrument (bass guitar or guitar) ... You can now download the offline XAP file to install & try it.
Download Locations for FretboardMaster 126.96.36.199 XAP file
Important Notice: Now Due To Unspecified Limitations, You Can Not Use The Offline XAP File To Install It Any More.
To try to install it manually from an SD card, you should choose one of the server location above to get the offline FretboardMaster XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.