This article tells you a simple way to download files through HttpClient and report the progress of downloading.

Content Length of HttpClient can often get the length of downloaded content, and ReadAsync can return the current length of read, adding the length of read to the length of downloaded content.

It looks simple, so I just give it to the code.

       private static async Task DownloadFile(string url, FileInfo file)
        {
            var httpClient = new HttpClient();
            var response = await httpClient.GetAsync(url);

            try
            {
                var n = response.Content.Headers.ContentLength;
                var stream = await response.Content.ReadAsStreamAsync();
                using(var fileStream = file.Create())
                using (stream)
                {
                    byte[] buffer = new byte[1024];
                    var readLength = 0;
                    int length;
                    while ((length = await stream.ReadAsync(buffer, 0, buffer.Length)) != 0)
                    {
                        readLength += length;

                        Console.WriteLine("Download progress" + ((double)readLength) / n * 100);

                        // Write to a file
                        fileStream.Write(buffer, 0, length);
                    }
                }
            
            }
            catch (Exception e)
            {
            }
        }

If you don't need to get progress, the easiest way is to

                var stream = await response.Content.ReadAsStreamAsync();
                using(var fileStream = file.Create())
                using (stream)
                {
                    await stream.CopyToAsync(fileStream);
                }

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