You are downloading the Bass Tuner XAP file v188.8.131.52 for Windows Phone. Bass Tuner is a free and useful Music app: HugeStar Bass Tuner, so you can easily use the mobile phone to do tuning for your bass, supports a variety of tunings style: four-string bass, ... You can now download the offline XAP file to install & try it.
Download Locations for Bass Tuner 184.108.40.206 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 Bass Tuner XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.