Strange as it seems, the free version is "temporarily" unavailable but the
versions for purchase are available.

Jack Cunniff wrote in :

I know this sounds like spam, but I'll bet that folks are really going
to be impressed with Google's new Earth viewer, downloadable from
earth.google.com. It's like maps.google.com and draws on the same the
satellite views, but now you can also rotate and tilt the view so that
you can appear to be on final into any runway... and the terrain is
accuately modeled, too.