You are downloading the Notification Sounds XAP file v188.8.131.52 for Windows Phone. Notification Sounds is a free and useful Music app: Notification Sounds The best sms ringtones in Windows Phone Store! Personalize your phone's sounds with this great application. - ... You can now download the offline XAP file to install & try it.
Download Locations for Notification Sounds 184.108.40.206 XAP file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Notification Sounds XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.