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void Start () {      
    ftpRequest = new WebClient();
    Debug.Log("Start: " + sourceFilePath + "/" + filename);
    System.Uri uri = new System.Uri(sourceFilePath + "/" + filename);
    try {
      ftpRequest.Credentials = new NetworkCredential(user, password);
      ftpRequest.DownloadProgressChanged += new DownloadProgressChangedEventHandler(DownloadProgressCallback);
      ftpRequest.DownloadDataCompleted += new DownloadDataCompletedEventHandler(DownloadCompleteCallback);
      ftpRequest.DownloadDataAsync(uri);      
    }
    catch(System.Exception e) {
      Debug.Log("Start: " + e.Message);
    }
  }
  
  void DownloadProgressCallback(System.Object sender, DownloadProgressChangedEventArgs e) {    
    bytesReceived += e.BytesReceived;    
    progressOutput = String.Format("{0:N} Bytes von {1:N} Bytes empfangen ({2:D}%)", bytesReceived, e.TotalBytesToReceive, e.ProgressPercentage);
    Debug.Log(progressOutput);
  }
  
  void DownloadCompleteCallback(System.Object sender, DownloadDataCompletedEventArgs e) {    
    try {
      byte[] data = (byte[])e.Result;
      if (data != null) {
        Debug.Log("DownloadCompleteCallback: " + destFilePath + "\\" + filename);
        FileStream fs = new FileStream(destFilePath + "\\" + filename, FileMode.Create);      
        fs.Write(data, 0, data.Length);      
        fs.Close();
      }
      else {        
        Debug.Log("DownloadCompleteCallback (data == null): " + e.Error);
      }
    }
    catch(System.Exception exception) {
      Debug.Log("DownloadCompleteCallback: " + exception.Message);
    }
  }                    

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using UnityEngine;
using System;
using System.Collections;
using System.IO;
using System.Net;

public class NewBehaviourScript2 : MonoBehaviour {
  
  WebClient ftpRequest;
  private string progressOutput = "";
  private string user = "l3s11195";
  private string password = "!BSfBtrp#";
  private string filename = "BWL.pdf";
  private string sourceFilePath = "ftp://michael-puff.de/html/Archiv/Ausbildung_FIAE";  //http://michael-puff.de/Archiv/Ausbildung_FIAE/BWL.pdf
  private string destFilePath = "C:\\Dokumente und Einstellungen\\mp\\Eigene Dateien";
  private long bytesReceived;

  internal class ???.WebClient{
        protected override WebRequest GetWebRequest(Uri address) {
            FtpWebRequest req = (FtpWebRequest)base.GetWebRequest(address);
            req.UsePassive = false;
            return req;
        }
    }                    

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using UnityEngine;
using System;
using System.Collections;
using System.IO;
using System.Net;


public class NewBehaviourScript2 : MonoBehaviour {

    internal class MyWebClient : WebClient
    {
        protected override WebRequest GetWebRequest(Uri address)
        {
            FtpWebRequest req = (FtpWebRequest)base.GetWebRequest(address);
            req.UsePassive = false;
            return req;
        }
    }

  MyWebClient ftpRequest;
  private string progressOutput = "";
  private string user = "???";
  private string password = "???";
  private string filename = "BWL.pdf";
  private string sourceFilePath = "ftp://michael-puff.de/html/Archiv/Ausbildung_FIAE";
  private string destFilePath = "C:\\Dokumente und Einstellungen\\mp\\Eigene Dateien";
  private long bytesReceived;  
  
  // Use this for initialization
  void Start () {      
    ftpRequest = new MyWebClient();
    Debug.Log("Start: " + sourceFilePath + "/" + filename);
    System.Uri uri = new System.Uri(sourceFilePath + "/" + filename);
    try {
      ftpRequest.Credentials = new NetworkCredential(user, password);
      ftpRequest.DownloadProgressChanged += new DownloadProgressChangedEventHandler(DownloadProgressCallback);
      ftpRequest.DownloadDataCompleted += new DownloadDataCompletedEventHandler(DownloadCompleteCallback);
      ftpRequest.DownloadDataAsync(uri);          
    }
    catch(System.Exception e) {            
      Debug.Log("Start: " + e.Message);
    }
  }
  
  void DownloadProgressCallback(System.Object sender, DownloadProgressChangedEventArgs e) {    
    bytesReceived += e.BytesReceived;    
    progressOutput = String.Format("{0:N} Bytes von {1:N} Bytes empfangen ({2:D}%)", bytesReceived, e.TotalBytesToReceive, e.ProgressPercentage);
    Debug.Log(progressOutput);
  }
  
  void DownloadCompleteCallback(System.Object sender, DownloadDataCompletedEventArgs e) {    
    try {
      byte[] data = (byte[])e.Result;            
      if (data != null) {
        Debug.Log("DownloadCompleteCallback: " + destFilePath + "\\" + filename);
        FileStream fs = new FileStream(destFilePath + "\\" + filename, FileMode.Create);      
        fs.Write(data, 0, data.Length);          
        fs.Close();
      }
      else {        
        Debug.Log("DownloadCompleteCallback (data == null): " + e.Error);
      }
    }
    catch(System.Exception exception) {
      Debug.Log("DownloadCompleteCallback: " + exception.Message);
    }
  }
}                    

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        protected override WebRequest GetWebRequest(Uri address)
        {
            return (FtpWebRequest)base.GetWebRequest(address);
        }                    

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    internal class MyWebClient : WebClient {
        protected override WebRequest GetWebRequest(Uri address) {
            return (FtpWebRequest)base.GetWebRequest(address);
        }
    }