static void Main(string[] args)

        {

            string url = "https://go.microsoft.com/fwlink/?linkid=2108895&clcid=0x409";

            DownloadBigFile(new Uri(url), "ssms.exe");

        }

        static void DownloadBigFile(Uri url, string outputFilePath)

        {

            const int BUFFER_SIZE =  * ;

            using (var outputFileStream = File.Create(outputFilePath, BUFFER_SIZE))

            {

                var req = WebRequest.Create(url);

                using (var response = req.GetResponse())

                {

                    using (var responseStream = response.GetResponseStream())

                    {

                        var buffer = new byte[BUFFER_SIZE];

                        int bytesRead;

                        do

                        {

                            bytesRead = responseStream.Read(buffer, , BUFFER_SIZE);

                            outputFileStream.Write(buffer, , bytesRead);

                        } while (bytesRead > );

                    }

                }

            }

        }