static void Main(string[] args)
    {
        string siteUrl = "https://ustglobal.sharepoint.com/sites/tech";
        string userName = "u53118@ust-global.com";
        Console.WriteLine("Password:");
        SecureString password = FetchPasswordFromConsole();
        using (ClientContext clientContext = new ClientContext(siteUrl))
        {
            Web web = clientContext.Web;
            clientContext.Credentials = new SharePointOnlineCredentials(userName, password);
            var list = clientContext.Web.Lists.GetByTitle("Documents created by team");
            var rootFolder = list.RootFolder;
            clientContext.Load(list);
            string pathString = @"d:docs";
            GetFoldersAndFiles(rootFolder, clientContext, pathString);

        }
        Console.ReadKey();

    }


    private static void GetFoldersAndFiles(Folder mainFolder, ClientContext clientContext, string pathString)
    {
        clientContext.Load(mainFolder, k => k.Files, k => k.Folders);
        clientContext.ExecuteQuery();
        foreach (var folder in mainFolder.Folders)
        {
            string folderPath = string.Format(@"{0}{1}", pathString, folder.Name);
            System.IO.Directory.CreateDirectory(folderPath);

            GetFoldersAndFiles(folder, clientContext, folderPath);
        }

        foreach (var file in mainFolder.Files)
        {
            var fileRef = file.ServerRelativeUrl;

            System.Console.WriteLine(file.ServerRelativeUrl);

            var fileInfo = Microsoft.SharePoint.Client.File.OpenBinaryDirect(clientContext, fileRef);
            var fileName = Path.Combine(pathString, file.Name);
            using (var fileStream = System.IO.File.Create(fileName))
            {

                fileInfo.Stream.CopyTo(fileStream);
            }


        }**strong text**