Bad News first: The Earth download page is down. This is, what the Google Earth Page currently says:
So, leave the passive role of the spectator and build your own interActive maps using the freshly released Google Maps API:
http://www.google.com/apis/maps/
(Google Earth - Temporarily Closed)"Thanks for your interest in Google Earth, but we're sorry we can't offer you a download right now. As you know, Google Earth is in beta, and we're still building out our ability to take on new users. ..."
So, leave the passive role of the spectator and build your own interActive maps using the freshly released Google Maps API:
http://www.google.com/apis/maps/