[CreateAssetMenu]
public class ManagerScriptableObject : ScriptableObject
{
    //variable will hold the instance value so we don't look for it everytime we need to access it
    //access the Instance only via the Current Property
    static ManagerScriptableObject _current;
    public static ManagerScriptableObject Current
    {
        get
        {
            //check if null or if the application is not playing
            //because we might've adedd an override so the current version could be invalid
            if (_current == null || !Application.isPlaying)
                _current = GetCurrent();

            return _current;
        }
    }
    static ManagerScriptableObject GetCurrent()
    {
        var list = Resources.LoadAll<ManagerScriptableObject>("");

        if (list.Length == 0) return null;

        for (int i = 0; i < list.Length; i++)
        {
            if (list[i].name.ToLower().Contains("override"))
                return list[i];
        }

        return list.First();
    }

    //Is there a Current instance ?
    public static bool AssetAvaliable { get { return Current != null; } }
}