The patch released today should fix two problems for Oculus Rift users.
* The game now doesn't crash when loaded without the "-vr" command line option
* You should not see a message about not owning the game.
If anyone else still has problems please try uninstalling then reinstalling the game to ensure the change from 32bit to 64bit copied all required files.
Please let me know if you have any issues in the Community Hub