Simulator X: Steam Edition Dow... | Microsoft Flight

: Access the Steam Library, right-click FSX: Steam Edition , select Properties , and go to the Betas tab. You can select specific older versions from the dropdown menu, and Steam will automatically download the required files.

: If a specific build is not in the Beta list, you can use the Steam Console and SteamDB to manually download older "depots" using specific manifest IDs. Restoring to "Vanilla" Default Microsoft Flight Simulator X: Steam Edition Dow...

If your goal is to "downgrade" from a heavily modded or broken state back to the original clean version: : Access the Steam Library, right-click FSX: Steam