http://www.techradar.com/news/google-is-pulling-the-plug-on-its-google-drive-desktop-software

If you use the Google Drive desktop software to keep your important files synced, you've got until 12 March 2018 to switch to an alternative.

Google will stop supporting the client on December 11 2017, then it will send it to the great hard drive in the sky three months later.