If you have a saved game created with an older version of Dream Engines and you want to continue this save, or if you just want to see how the game used to be before the latest updates, you can use Steam's beta branch feature to download and play older versions of Dream Engines.
1. Right click the game in your steam library, and select "Properties".
2. Select the "Betas" tab on the left
3. Click the "Beta Participation" drop-down and select the version that you want to play.
4. Wait for Steam to download and install the version you selected, then launch the game.