If you are receiving an error at game launch in Steam that reads “missing executable”, then you are currently not opted-in to the beta in your game properties.
🛠 Please follow Part B of the Steam installation instructions.
We are aware that game updates, Steam updates, and Windows updates can cause your beta options to become unset in Steam. You will need to re-enter your beta password as described above.
An example of this error, however the game name and file pathway will vary between betas: