如何在unity中从url下载zip文件？

using UnityEngine;
using UnityEngine.Networking;
using System.IO;

public class DownloadManager : MonoBehaviour
{
    public string url; // 要下载的ZIP文件的URL
    public string savePath; // 下载后保存的文件路径

    public void StartDownload()
    {
        StartCoroutine(DownloadFile());
    }

    private IEnumerator DownloadFile()
    {
        using (UnityWebRequest www = UnityWebRequest.Get(url))
        {
            yield return www.SendWebRequest();

            if (www.result == UnityWebRequest.Result.ConnectionError || www.result == UnityWebRequest.Result.ProtocolError)
            {
                Debug.LogError(www.error);
            }
            else
            {
                // 下载成功，保存文件到指定路径
                File.WriteAllBytes(savePath, www.downloadHandler.data);
                Debug.Log("File downloaded and saved to: " + savePath);
            }
        }
    }
}