You will need to have Google Earth installed on your PC. Please visit
Google Earth's Home Page at
http://earth.google.com
for more information.
After downloading the Google Earth setup
program, you will need to run it in order to install Google Earth on your
PC. Note: Simply downloading the setup program is not enough, you
must actually run it (double-click on it) in order to install
Google Earth to your PC.
Once you have installed Google Earth on your
PC, click the link at the top of this page to load the GCP Archive.