Navigate to your Steam Client and Right Click on Ark: Survival Evolved and click on Properties.
After this, Click on Betas, you will notice some boxes here.
Click on the Drop Down menu to select your Beta Version or Full Release version of the game.
Select the version you wish to play and click close the window, from there, still will notice the change and will require you to update.
Ark guide
How to backdate your ark survival evolve game
This guide will show you how to backdate your Ark: Survival Evolved games on the Steam client, allowing the player to select and play different updates.