• When the small white window pops up ("Trying to update the launcher"), let it open and start the game a second time.
• The launcher should open now. If it does not, close the second white window and try again.
• When it's stuck on connecting, close the launcher and start the game again.
• Now it should run it's normal routine with the short "Patching" and you should be able to start the game.
When the game finally starts, close the small white window.