...://sourceforge.net/p/lntogoogle/wiki/InstallationPitfalls/
The project was not maintained since its last update in February 2015.
However, since I've tracked more than 15.000 Downloads over the last 5 years and still more than 1 million Calendar API-Calls per day, I assume that the tool is still very much in use. So I decided to go back to work.
More info:
https://sourceforge.net/p/lntogoogle/wiki/Home/
Donations appreciated