On Wednesday, February 8, 2017 at 11:11:35 PM UTC-7, JS wrote:
Just tried to use IGC Flight Replay and had errors.
Looked on the Flight Replay website, found the news.
http://ywtw.de/igcsimen.html
15.01.2017 Unfortunately Google does not support the interface to Google Earth anymore. Therefore for the time being IGC Replay will not be offered anymore. I Hope you had a lot of fun with IGC Replay.

We'll see if it can be fixed.
Jim

You might want to look at CloudAhoy too. It's geared towards powered and isn't free but it has a feature similar to what you are describing.