Program: 20801
Project: 20801
Buggy source:
@Override public void handleFree(DownloadLink downloadLink) throws Exception {
  requestFileInformation(downloadLink);
  if (!checkPassword(downloadLink)) {
    return;
  }
  handleErrors(downloadLink);
  if (br.containsHTML("String_Node_Str")) {
    String captchaAddress=br.getRegex("String_Node_Str").getMatch(0);
    if (captchaAddress == null)     throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT);
    HashMap<String,String> input=HTMLParser.getInputHiddenFields(br + "String_Node_Str");
    String code=getCaptchaCode(captchaAddress,downloadLink);
    String geturl=downloadLink.getDownloadURL() + "String_Node_Str" + code+ "String_Node_Str"+ input.get("String_Node_Str")+ "String_Node_Str"+ input.get("String_Node_Str")+ "String_Node_Str"+ System.currentTimeMillis();
    br.getPage(geturl);
    requestFileInformation(downloadLink);
    if (!checkPassword(downloadLink)) {
      return;
    }
    handleErrors(downloadLink);
  }
  String url=findDownloadUrl();
  if (url == null)   throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT);
  br.setFollowRedirects(true);
  dl=jd.plugins.BrowserAdapter.openDownload(br,downloadLink,url,true,1);
  if (!dl.getConnection().isContentDisposition()) {
    br.followConnection();
    if (br.containsHTML("String_Node_Str"))     throw new PluginException(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE,"String_Node_Str",10 * 60 * 1000l);
    if (br.getHttpConnection().getContentLength() == 0)     throw new PluginException(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE,"String_Node_Str",10 * 60 * 1000l);
    if (br.getHttpConnection().toString().contains("String_Node_Str"))     throw new PluginException(LinkStatus.ERROR_IP_BLOCKED,5 * 60 * 1000l);
    if (br.getHttpConnection().toString().contains("String_Node_Str"))     throw new PluginException(LinkStatus.ERROR_RETRY);
    correctDownloadLink(downloadLink);
    throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT);
  }
  if (!dl.startDownload()) {
    downloadLink.getLinkStatus().setRetryCount(0);
  }
}

Fixed version (ground truth):
@Override public void handleFree(DownloadLink downloadLink) throws Exception {
  requestFileInformation(downloadLink);
  if (!checkPassword(downloadLink)) {
    return;
  }
  handleErrors(downloadLink);
  if (br.containsHTML("String_Node_Str")) {
    String captchaAddress=br.getRegex("String_Node_Str").getMatch(0);
    if (captchaAddress == null)     throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT);
    HashMap<String,String> input=HTMLParser.getInputHiddenFields(br + "String_Node_Str");
    String code=getCaptchaCode(captchaAddress,downloadLink);
    String geturl=downloadLink.getDownloadURL() + "String_Node_Str" + code+ "String_Node_Str"+ input.get("String_Node_Str")+ "String_Node_Str"+ input.get("String_Node_Str")+ "String_Node_Str"+ System.currentTimeMillis();
    br.getPage(geturl);
    requestFileInformationInternal(downloadLink);
    if (!checkPassword(downloadLink)) {
      return;
    }
    handleErrors(downloadLink);
  }
  String url=findDownloadUrl();
  if (url == null)   throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT);
  br.setFollowRedirects(true);
  dl=jd.plugins.BrowserAdapter.openDownload(br,downloadLink,url,true,1);
  if (!dl.getConnection().isContentDisposition()) {
    br.followConnection();
    if (br.containsHTML("String_Node_Str"))     throw new PluginException(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE,"String_Node_Str",10 * 60 * 1000l);
    if (br.getHttpConnection().getContentLength() == 0)     throw new PluginException(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE,"String_Node_Str",10 * 60 * 1000l);
    if (br.getHttpConnection().toString().contains("String_Node_Str"))     throw new PluginException(LinkStatus.ERROR_IP_BLOCKED,5 * 60 * 1000l);
    if (br.getHttpConnection().toString().contains("String_Node_Str"))     throw new PluginException(LinkStatus.ERROR_RETRY);
    correctDownloadLink(downloadLink);
    throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT);
  }
  if (!dl.startDownload()) {
    downloadLink.getLinkStatus().setRetryCount(0);
  }
}