using System;

using System.IO;

using System.Net.Http;

using System.Threading;

​

public class Program

{

    static readonly string DOWNLOAD_URL = "https://installer.demo.accurx.com/chain/4.22.50587.0/accuRx.Installer.Local.msi";

    static readonly string DOWNLOAD_FILE = "accuRx.Installer.Local.msi";

​

    public static void Main()

    {

        bool downloaded = false;

        long downloadedBytes = 0;

​

        while (!downloaded)

        {

            try

            {

                using (HttpClient client = new HttpClient())

                {

                    // Set the range header to resume a partial download.

                    client.DefaultRequestHeaders.Range = new System.Net.Http.Headers.RangeHeaderValue(downloadedBytes, null);

​

                    using (Stream contentStream = client.GetStreamAsync(DOWNLOAD_URL).Result,

                                  fileStream = new FileStream(DOWNLOAD_FILE, FileMode.Append, FileAccess.Write, FileShare.None))

                    {

                        // Read the content stream and write to the file stream.

                        byte[] buffer = new byte[1024 * 1024];

                        int bytesRead;

                        while ((bytesRead = contentStream.Read(buffer, 0, buffer.Length)) > 0)

                        {

                            fileStream.Write(buffer, 0, bytesRead);

                            downloadedBytes += bytesRead;

                        }

                    }

​

                    // The download is complete.

                    downloaded = true;

                }

            }

            catch (HttpRequestException)

            {

                // The download was interrupted by a network error.

                Console.WriteLine("Network error. Retrying in 2 minutes...");

                Thread.Sleep(TimeSpan.FromMinutes(2));

            }

        }

​

        Console.WriteLine($"Download complete. {downloadedBytes} bytes downloaded.");

    }

}

​