While trying to automate my Google Earth into an offline cache, I found this blog .
As it turns out, this man has described ways to load several types of maps offline, including topo maps and Google Earth.
To download Google Earth offline, you will need software from a companion site (free to use, $20 to donation) called Dr. Regener 
I am now in the process of creating high resolution offline Google Earth caches that can be placed onto an external thumb drive and viewed as needed without access to the Internet. – Dan in Florida