Google Earth 7.1 introduces these new features:
Google Earth 7.0:
Google Earth 6.2:
Google Earth 6.1:
Google Earth 6.0:
Google Earth 5.2:
Google Earth 5.0:
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Yes, you can download Google Earth for free. There is also a professional version of Google Earth called Google Earth Pro for business users. That version has some new features (e.g., better printing, advanced import support, etc.) but uses the same imagery so it's generally not worth the annual cost for the casual user.
See related links for lots of "secrets" and interesting places found in Google Earth.Also try searching for "secrets google earth" in any search engine (like Google) and you'll see lots of hits.If you mean "secret" or hidden features in Google Earth (also known as "easter eggs") then see related questions.
Google Earth Pro is the professional version of Google Earth with advanced features for business users.Google Earth Pro has following improvements over the free version:Pro performance is fasterPro has higher resolution printing 4800 pixels vs 1000 pixels.Pro able to import GIS data files (e.g. GeoTiff, CSV files, etc.)Pro has area measurement toolPro has additional layers (e.g. U.S. Parcel and Demographics data)...Google Earth Pro has an annual subscription of $399 which includes support.Both Google Earth and Google Earth Pro use the same imagery. In other words, you don't get higher resolution imagery by paying for the Pro version.
The latest (non-beta) version of Google Earth is 7.1.7.2605 released in Oct 2016. The previous stable version was 7.1.6 released in May 2016. The initial version was released in 2001. The 7.x and 6.x versions of Google Earth version include Street View, viewing Mars, Sky view, looking under water at things like the RMS Titanic, a Flight Simulator, among other useful features. Note as of Jan 2012 Street View is no longer be supported in Google Earth 5.2 or older.
Normally Google Earth Pro auto-updates to the new version when it is available but if that feature is disabled or not working you can manually install the latest version. Visit the Google Earth download page to download the latest version for Windows, Mac, or Linux desktop platforms. You can show the version of Google Earth in the Hep menu and selecting "About Google Earth". Note that Google Earth desktop has been replaced with Google Earth Pro so all updates will be with the latter.For the web version of Google Earth, your web browser always accesses the latest version and you never have to install or uninstall the application.Mobile platforms can update Google Earth using the Google Store, Apple store, or equivalent application management utlility on the particular platform.