You are downloading the GoVoice XAP file v220.127.116.11 for Windows Phone. GoVoice is a free and useful Social app: GoVoice now fully supports mango in addition to push notifications available to free users on a trial basis. Get push notifications for Google ... You can now download the offline XAP file to install & try it.
Download Locations for GoVoice 18.104.22.168 XAP file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline GoVoice XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.