Answer
– Check the ‘Files’ tab from ‘Preferences’ window: the ‘Use route tracks’ option should be checked. Furthermore:
– Check your firewall to be sure that Tyre may connect to the internet.
If that does not solve the problem, rerun the setup.
With Google Earth, there is another way to show your route from waypoint to waypoint: if you have your route displayed in Google Earth, each individual waypoint comes with a description that says ‘Show route (Google Earth)’. If you click this description, the route will be calculated and shown from that waypoint to the next one.