You are downloading the Google XAP file v2.0.295.80 for Windows Phone. Google is a free Productivity App: Search faster and easier with the Google Search app for Windows Phone. With Google Search, you can talk to Google and understand the world’s people,. You can now download the offline XAP package file to install & try it.
Download Locations for Google 2.0.295.80 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 Google XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.