Program: 21190
Project: 21190
Buggy source:
@Override public void handleFree(DownloadLink downloadLink) throws Exception {
  LinkStatus linkStatus=downloadLink.getLinkStatus();
  url=downloadLink.getDownloadURL() + "String_Node_Str";
  if (!getFileInformation(downloadLink)) {
    linkStatus.addStatus(LinkStatus.ERROR_FILE_NOT_FOUND);
    return;
  }
  File captchaFile=this.getLocalCaptchaFile(this);
  try {
    Browser.download(captchaFile,br.cloneBrowser().openGetConnection("String_Node_Str"));
  }
 catch (  Exception e) {
    throw new PluginException(LinkStatus.ERROR_CAPTCHA);
  }
  captchaCode=Plugin.getCaptchaCode(captchaFile,this,downloadLink);
  Form form=br.getForm(1);
  if (form.containsHTML("String_Node_Str")) {
    if (downloadLink.getStringProperty("String_Node_Str",null) == null) {
      passCode=Plugin.getUserInput(null,downloadLink);
    }
 else {
      passCode=downloadLink.getStringProperty("String_Node_Str",null);
    }
    form.put("String_Node_Str",passCode);
  }
  form.put("String_Node_Str",captchaCode);
  br.submitForm(form);
  if (br.containsHTML("String_Node_Str") || br.containsHTML("String_Node_Str")) {
    if (br.containsHTML("String_Node_Str")) {
      downloadLink.setProperty("String_Node_Str",null);
    }
    linkStatus.addStatus(LinkStatus.ERROR_CAPTCHA);
    return;
  }
  if (br.containsHTML("String_Node_Str") | br.containsHTML("String_Node_Str")) {
    linkStatus.addStatus(LinkStatus.ERROR_IP_BLOCKED);
    linkStatus.setValue(3600000l);
    return;
  }
  downloadLink.setProperty("String_Node_Str",passCode);
  String all=br.getRegex("String_Node_Str").getMatch(-1);
  String dec=br.getRegex("String_Node_Str").getMatch(-1);
  Context cx=Context.enter();
  Scriptable scope=cx.initStandardObjects();
  String fun="String_Node_Str" + all + "String_Node_Str"+ dec+ "String_Node_Str";
  Object result=cx.evaluateString(scope,fun,"String_Node_Str",1,null);
  url=Context.toString(result);
  Context.exit();
  sleep(15000,downloadLink);
  br.setFollowRedirects(true);
  dl=br.openDownload(downloadLink,url);
  dl.startDownload();
}

Fixed version (ground truth):
@Override public void handleFree(DownloadLink downloadLink) throws Exception {
  LinkStatus linkStatus=downloadLink.getLinkStatus();
  url=downloadLink.getDownloadURL() + "String_Node_Str";
  if (!getFileInformation(downloadLink)) {
    linkStatus.addStatus(LinkStatus.ERROR_FILE_NOT_FOUND);
    return;
  }
  br.getPage(url);
  File captchaFile=this.getLocalCaptchaFile(this);
  try {
    Browser.download(captchaFile,br.cloneBrowser().openGetConnection("String_Node_Str"));
  }
 catch (  Exception e) {
    throw new PluginException(LinkStatus.ERROR_CAPTCHA);
  }
  captchaCode=Plugin.getCaptchaCode(captchaFile,this,downloadLink);
  Form form=br.getForm(1);
  if (form.containsHTML("String_Node_Str")) {
    if (downloadLink.getStringProperty("String_Node_Str",null) == null) {
      passCode=Plugin.getUserInput(null,downloadLink);
    }
 else {
      passCode=downloadLink.getStringProperty("String_Node_Str",null);
    }
    form.put("String_Node_Str",passCode);
  }
  form.put("String_Node_Str",captchaCode);
  br.submitForm(form);
  if (br.containsHTML("String_Node_Str") || br.containsHTML("String_Node_Str")) {
    if (br.containsHTML("String_Node_Str")) {
      downloadLink.setProperty("String_Node_Str",null);
    }
    linkStatus.addStatus(LinkStatus.ERROR_CAPTCHA);
    return;
  }
  if (br.containsHTML("String_Node_Str") | br.containsHTML("String_Node_Str")) {
    linkStatus.addStatus(LinkStatus.ERROR_IP_BLOCKED);
    linkStatus.setValue(3600000l);
    return;
  }
  downloadLink.setProperty("String_Node_Str",passCode);
  String all=br.getRegex("String_Node_Str").getMatch(-1);
  String dec=br.getRegex("String_Node_Str").getMatch(-1);
  Context cx=Context.enter();
  Scriptable scope=cx.initStandardObjects();
  String fun="String_Node_Str" + all + "String_Node_Str"+ dec+ "String_Node_Str";
  Object result=cx.evaluateString(scope,fun,"String_Node_Str",1,null);
  url=Context.toString(result);
  Context.exit();
  sleep(15000,downloadLink);
  br.setFollowRedirects(true);
  dl=br.openDownload(downloadLink,url);
  dl.startDownload();
}