在开始使用FirebaseRemoteConfig之前，你必须获取并激活它。你还应该决定你要使用的值的类型，例如Long。下一个例子应该可以工作：

using UnityEngine;
using UnityEngine.SceneManagement;
using Firebase.RemoteConfig;

public class GameOpening : MonoBehaviour
{
    Firebase.DependencyStatus dependencyStatus = Firebase.DependencyStatus.UnavailableOther;
    // Use this for initialization
    async void Start()
    {
        await Firebase.FirebaseApp.CheckAndFixDependenciesAsync().ContinueWith(async task => {
            var dependencyStatus = task.Result;
            if (dependencyStatus == Firebase.DependencyStatus.Available)
            {
                await FirebaseRemoteConfig.DefaultInstance.FetchAsync(TimeSpan.Zero);
                await FirebaseRemoteConfig.DefaultInstance.ActivateAsync();
                UnityEngine.Debug.Log(FirebaseRemoteConfig.DefaultInstance.GetValue("VERSION").LongValue);
            }
            else
            {
                UnityEngine.Debug.LogError(
                    "Could not resolve all Firebase dependencies: " + dependencyStatus);
            }
        });    
}