private void btnGetDownload_Click(object sender, EventArgs e)
        {
            string fileName = System.IO.Path.GetFileName(videosLinks[0]);
            DownloadFile(videosLinks[0], @"D:\Videos\videos\" + fileName);
        }

        public void DownloadFile(string urlAddress, string location)
        {
            Stopwatch sw = new Stopwatch();
            using (WebClient webClient = new WebClient())
            {
                webClient.Headers.Add("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0 Chrome");
                webClient.DownloadFileCompleted += new AsyncCompletedEventHandler((sender, e) => Completed(sender, e, sw));
                webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler((sender, e) => ProgressChanged(sender, e, sw));
                Uri URL = new Uri(urlAddress);
                sw.Start();
                try
                {
                    webClient.DownloadFileAsync(URL, location);
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }
        }

        private void ProgressChanged(object sender, DownloadProgressChangedEventArgs e, Stopwatch sw)
        {
            string downloadProgress = e.ProgressPercentage + "%";
            string downloadSpeed = string.Format("{0} MB/s", (e.BytesReceived / 1024.0 / 1024.0 / sw.Elapsed.TotalSeconds).ToString("0.00"));
            string downloadedMBs = Math.Round(e.BytesReceived / 1024.0 / 1024.0) + " MB";
            string totalMBs = Math.Round(e.TotalBytesToReceive / 1024.0 / 1024.0) + " MB";

            // Format progress string
            string progress = $"{downloadedMBs}/{totalMBs} ({downloadProgress}) @ {downloadSpeed}"; // 10 MB / 100 MB (10%) @ 1.23 MB/s

            progressBarText1.Value = e.ProgressPercentage;
            progressBarText1.Refresh();
            progressBarText1.CustomText = progress;
        }

        private void Completed(object sender, AsyncCompletedEventArgs e, Stopwatch sw)
        {
            if (e.Cancelled == true)
            {
                btnGetDownload.Text = "Fails.";
                sw.Stop();
            }
            else
            {
                btnGetDownload.Text = "Finish.";
                sw.Stop();

                if (videosLinks.Count > 0)
                {
                    videosLinks.RemoveAt(0);
                    string fileName = System.IO.Path.GetFileName(videosLinks[0]);
                    DownloadFile(videosLinks[0], @"D:\Videos\videos\" + fileName);
                }
            }
        }

        static readonly string[] SizeSuffixes =
                  { "bytes", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB" };
        static string SizeSuffix(Int64 value, Int64 totalValue)
        {
            if (value < 0) { return "-" + SizeSuffix(-value, totalValue); }

            int i = 0;
            decimal dValue = (decimal)value;
            while (Math.Round(dValue / 1024) >= 1)
            {
                dValue /= 1024;
                i++;
            }

            return string.Format("{0:n1} {1} {2}", dValue, SizeSuffixes[i], (totalValue / 1024d / 1024d).ToString("0.00"));
        }