1、Unity下载Zip压缩文件主要使用UnityWebRequest类。

可以参考以下方法：

        webRequest = UnityWebRequest.Get(Path1);  //压缩文件路径webRequest.timeout = 60;webRequest.downloadHandler = new DownloadHandlerBuffer();long fileSize = GetLocalFileSize(Path2);  //存贮路径webRequest.SetRequestHeader("Range", "bytes=" + fileSize + "-");        webRequest.SendWebRequest();while (!webRequest.isDone){float progress = Mathf.Clamp01(webRequest.downloadProgress);progressBar.fillAmount = progress;progressText.text = string.Format("{0}%", Mathf.RoundToInt(progress * 100f));yield return null;}if (webRequest.isNetworkError || webRequest.isHttpError){progressObj.SetActive(false);            }else{byte[] downloadedData = webRequest.downloadHandler.data;            File.WriteAllBytes(Path2, downloadedData);}

其中这里我还用个while循环写了个下载进度条。 

2、解压Zip压缩文件用到的System.IO.Compression下的ZipFile.OpenRead（）方法。

具体可以参考以下代码：

    /// <summary>/// 解压/// </summary>/// <param name="zipFilePath">压缩文件路径</param>/// <param name="extractPath">解压路径</param>public void ExtractZipFile(string zipFilePath, string extractPath){using (ZipArchive archive = ZipFile.OpenRead(zipFilePath)){            try{foreach (ZipArchiveEntry entry in archive.Entries){string entryPath = Path.Combine(extractPath, entry.FullName);if (entry.Name == ""){Directory.CreateDirectory(entryPath);}else{                        entry.ExtractToFile(entryPath, true);                   }}}catch(Exception e){UnityEngine.Debug.Log(e.Message);        }           }}