Unfortunately google has officially removed all support for the google earth browser plugin as of January 12th, 2017. We are currently looking at other options to see if we can at least replicate most of the functionality of the fly through feature, as we know this is very popular with our design tool users. We are as disappointed as our customer base that google has deprecated this feature as it was a very useful tool for designing wireless networks and the Google Earth plug was the best interface for delivering the fly through feature. If we find a suitable alternative, we will update the tool to re-enable this functionality.
For the more information about the API deprecation check: https://maps-apis.googleblog.com/2014/12/announcing-deprecation-of-google-earth.html