Get and download files from SharePoint Document library (desired folder) using CSOM

Sample code to read documents from desired folder in library and download locally to disk.
To work with C#(CSOM), use namespace (reference) Microsoft.SharePoint.Client.

static void Main(string[] args)
        {
            ClientContext cxt = new ClientContext("http://sp-test/sites/test");
            List list = cxt.Web.Lists.GetByTitle("Documents");
            cxt.Load(list);
            cxt.Load(list.RootFolder);
            cxt.Load(list.RootFolder.Folders);
            cxt.Load(list.RootFolder.Files);
            cxt.ExecuteQuery();
            FolderCollection folders = list.RootFolder.Folders;
            foreach (Folder folder in folders)
            {
                if ((folder.Name != "Forms")&(folder.Name == "Special Documents"))
                {
                    cxt.Load(folder.Files);
                    cxt.ExecuteQuery();
                    FileCollection fileCol = folder.Files;
                                      
                    foreach (Microsoft.SharePoint.Client.File file in fileCol)
                    {
                        string ServerRelativeUrl = file.ServerRelativeUrl;
                        DownloadFiles(ServerRelativeUrl);
                    }
                }
            }
        }
        public static void DownloadFiles(string ServerRelativeUrl)
        {
            ClientContext clientContext = new ClientContext("http://sp-test/sites/test");
            Web web = clientContext.Web;
            Microsoft.SharePoint.Client.File filetoDownload = web.GetFileByServerRelativeUrl(ServerRelativeUrl);
            clientContext.Load(filetoDownload);
            clientContext.ExecuteQuery();
            var fileRef = filetoDownload.ServerRelativeUrl;
            var fileInfo = Microsoft.SharePoint.Client.File.OpenBinaryDirect(clientContext, fileRef);
            var fileName = Path.Combine(@"C:\Temp\Document", (string)filetoDownload.Name);

            using (var fileStream = System.IO.File.Create(fileName))
            {
                fileInfo.Stream.CopyTo(fileStream);
            }
        }

Happy Coding!