Check the Steam installation
- Update the Steam client.
- In your Steam library, right-click Melvor Idle 2 Demo and open Properties.
- Select Installed Files, then Verify Integrity of Demo Files.
- Wait for Steam to finish, then launch the Demo again.
If it still hangs
Note the exact error and where it appears. A Steam initialization message and a Melvor Cloud sign-in error occur at different points in startup. Keep the message, platform and game version handy when checking the Steam support thread.