First, you haven't said which Zurich you are referring to, FSX or MSFS version ? Are you sure it stopped and, instead, it quit because it had nothing left to do ?
As explained in so many other threads, when the update has finished, it will quite automatically because, since it updates everything to the latest version, it would be completely useless to ask you permission to exit, when the only meaningful choice at that point ( you are running an updater that has already updated everything ), would be to exit, so it will exit.
