HI everyone. I've heard reports that for some people, Steam is asking you to purchase the game when you already own it, or it is missing from your library. It is likely just an issue caused by today's routine server maintenance and is not limited to VTOL VR. Please wait a little while to allow them to resolve the issue or try restarting Steam. I assure you that it was not caused by the v1.0 update.
Thank you and sorry for the inconvenience!