You are downloading the The Stock XAP file v18.104.22.168 for Windows Phone. The Stock is a paid and fun Simulation game: If this version is too expensive for you, a free version is available too! Rated second best in the WMpoweruser.com survey for favorite WP7 games ... You can now download the offline XAP file to install & try it.
Download Locations for The Stock 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 The Stock XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.