You are downloading the SlingPlayer XAP file v1.8.301.0 for Windows Phone. SlingPlayer is a free and useful Music app: Turn your Windows Phone into a TV! If you own a Slingbox (or are a DISH Network subscriber), click "show details" for details about SlingPlayer app ... You can now download the offline XAP file to install & try it.
Download Locations for SlingPlayer 1.8.301.0 XAP file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline SlingPlayer XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.