You are downloading the GuitarTab XAP file v18.104.22.168 for Windows Phone. GuitarTab is a free and useful Music app: GuitarTab is your personal guitar tab database on Windows Phone 8. All tabs available on www.songsterr.com are now available on your Windows Phone 8 ... You can now download the offline XAP file to install & try it.
Download Locations for GuitarTab 22.214.171.124 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 GuitarTab XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.