Google Earth is an interesting service which is used my millions of people to take a look of 3D version of cities. But how many people opted for pro subscription? There are very few. This is the reason why Google has decided to make the pro version of the Google Earth free of cost. Earlier it costed $399 per year.
You still need to get a key from Google to use the Pro features. Fill this form to get one. It will work for The download the Pro client from here. If you are an existing user, you do not need to do anything. Just continue using the service as you do.
Google Earth Pro offers various advanced features including print Images at 4800 x 3200 pixels while free account could only do at 1000 x 1000, automatically import thousands of addresses and pin to map, measure distances using lines, paths, polygons, circles and record HD movies of your virtual flights.
Source: Google Maps blog
