Problems with downloadstring in C#

var Webpagestring01 = string.Empty;
            using (var web = new System.Net.WebClient())
                Webpagestring01 = web.DownloadString("https://www.dropbox.com/s/yqig5di1smlkjkl/update.txt?dl=0");

            if (Webpagestring01.Contains("2.0.0"))
            {
                Console.ForegroundColor = ConsoleColor.Cyan;
                Console.WriteLine("                                                  Update Found!");
                Console.WriteLine();
                Console.ResetColor();
                Console.WriteLine("------------------------------------------------------------------------------------------------------------------------");
                Console.WriteLine("Press 1 to install the update or press 2 if you want to continue to the Menu");
                Console.WriteLine();
                Console.WriteLine("------------------------------------------------------------------------------------------------------------------------");
                int answer06 = Convert.ToInt32(Console.ReadLine());
                if (answer06 == 1)
                {
                    Process.Start("https://www.dropbox.com/sh/6gx6zf2lpy1u4xj/AAAEF7wgUrxYGX9v8PKvEmXna?dl=1");
                }
                else if (answer06 == 2)
                {
                    for (int i = 1; i <= 35; i++)
                    {
                        Console.WriteLine();
                    }
                    goto Menu;
                }
            }