You are downloading the Guitar Player XAP file v1.0.0.0 for Windows Phone. Guitar Player is a free Music Game: Try to play on WP7 Guitar and create your own. You can now download the offline XAP package file to install & try it.
Download Locations for Guitar Player 1.0.0.0 XAP file
Package File
Please Click Here > to retrieve available package files for Guitar Player.
Please be aware that the Guitar Player XAP file you are to download is hosted on the Microsoft Store CDN server. You can read more about Guitar Player or get it on Microsoft Store.
To try to install it manually from an SD card, you should choose one of the server location above to get the offline Guitar Player XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.