: If your Steam client is open, it will automatically detect the update and begin downloading it. If it doesn't, right-click Subnautica in your Library, select Properties > Installed Files , and click Verify integrity of game files to force an update check.
: Once the download is complete, Steam will provide a file path (usually under Steam\steamapps\content\app_264710 ). You can move these files to a separate folder to run that specific version.
: Press Win + R and type steam://open/console .
If you are playing on a modern platform, the update should be applied automatically without manual intervention.
: These launchers also handle updates automatically upon startup.
: Your console will prompt you to download the update before launching the game while connected to the internet. Manual Downgrade to Update 84 (Advanced Users)
: In the console, use the command structure download_depot . For Subnautica Windows, the AppID is 264710 and the DepotID is 264712 .
If you are looking for Update 84 specifically to maintain compatibility with older mods or for speedrunning purposes, you can manually revert your game version using the Steam Console.