Program: 21059
Project: 21059
Buggy source:
@Override public void handleFree(DownloadLink downloadLink) throws Exception, PluginException {
  requestFileInformation(downloadLink);
  br.setFollowRedirects(true);
  br.getPage(downloadLink.getDownloadURL());
  String dlpage0=br.getRegex("String_Node_Str").getMatch(0);
  if (dlpage0 == null)   throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFEKT);
  String dlpage1="String_Node_Str" + dlpage0;
  br.getPage(dlpage1);
  String captchaid=br.getRegex("String_Node_Str").getMatch(0);
  if (captchaid == null)   throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFEKT);
  String captchaurl="String_Node_Str" + captchaid;
  String code=getCaptchaCode(captchaurl,downloadLink);
  Form captchaForm=br.getForm(1);
  if (captchaForm == null)   throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFEKT);
  captchaForm.put("String_Node_Str",code);
  br.submitForm(captchaForm);
  String dllink=br.getRedirectLocation();
  if (br.containsHTML("String_Node_Str"))   throw new PluginException(LinkStatus.ERROR_CAPTCHA);
  try {
    ((Ftp)JDUtilities.getNewPluginForHostInstance("String_Node_Str")).download(Encoding.urlDecode(dllink,true),downloadLink);
  }
 catch (  InterruptedIOException e) {
    if (downloadLink.isAborted())     return;
    throw e;
  }
catch (  IOException e) {
    if (e.toString().contains("String_Node_Str")) {
      throw new PluginException(LinkStatus.ERROR_IP_BLOCKED,10 * 60 * 1000l);
    }
 else     throw e;
  }
}

Fixed version (ground truth):
@Override public void handleFree(DownloadLink downloadLink) throws Exception, PluginException {
  requestFileInformation(downloadLink);
  br.setFollowRedirects(true);
  Form form=br.getForm(2);
  form.setAction("String_Node_Str");
  if (form == null)   throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFEKT);
  this.sleep(5 * 1001l,downloadLink);
  br.submitForm(form);
  this.sleep(10 * 1001l,downloadLink);
  URLConnectionAdapter con=br.cloneBrowser().openGetConnection("String_Node_Str" + System.currentTimeMillis());
  con.disconnect();
  String captchaid=br.getRegex("String_Node_Str").getMatch(0);
  if (captchaid == null)   throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFEKT);
  String captchaurl="String_Node_Str" + captchaid;
  String code=getCaptchaCode(captchaurl,downloadLink);
  this.sleep(10 * 1001l,downloadLink);
  Form captchaForm=br.getForm(1);
  if (captchaForm == null)   throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFEKT);
  captchaForm.put("String_Node_Str",code);
  br.setFollowRedirects(false);
  br.submitForm(captchaForm);
  String dllink=br.getRedirectLocation();
  if (br.containsHTML("String_Node_Str"))   throw new PluginException(LinkStatus.ERROR_CAPTCHA);
  if (dllink == null)   throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFEKT);
  try {
    ((Ftp)JDUtilities.getNewPluginForHostInstance("String_Node_Str")).download(Encoding.urlDecode(dllink,true),downloadLink);
  }
 catch (  InterruptedIOException e) {
    if (downloadLink.isAborted())     return;
    throw e;
  }
catch (  IOException e) {
    if (e.toString().contains("String_Node_Str")) {
      throw new PluginException(LinkStatus.ERROR_IP_BLOCKED,10 * 60 * 1000l);
    }
 else     throw e;
  }
}