You are downloading the AVK Music Player XAP file v126.96.36.199 for Windows Phone. AVK Music Player is a free Music App: ****PLEASE READ BEFORE YOU DOWNLOAD****Microsoft does not give full access to Developers to Edit Playlists/Delete Songs and few other features, so you will not. You can now download the offline XAP package file to install & try it.
Download Locations for AVK Music Player 188.8.131.52 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 AVK Music Player XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.