I downloaded this release of Facepunch Steamworks:
Then I took Unity folder from the release archive, renamed it and copied to Assets/Plugins. I created a new script
using UnityEngine;
using Steamworks;
namespace Astro
{
public class SteamworksManager : MonoBehaviour
{
}
}
But I get compilation error saying that the "Steamworks namespace cannot be found".
I tried reloading Unity and Visual Studio. Also I tried using Facepunch.Steamworks; It also not working.
I had the same issue when using Unity on Linux. I think I fixed it after opening the Properties of Facepunch.Steamworks.Posix.dll and changing the OS in Platform settings from OSX to Linux.