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public Task DownloadFile(string url, string pathfile)
        {
            var res = Task.Run(async() =>
            {
                try
                {
                    request = new RestRequest(url);
                    request.AddHeader("accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9");
                    request.AddHeader("sec-fetch-site", "same-origin");
                    request.AddHeader("sec-fetch-dest", "empty");
                    request.AddHeader("accept-language", "en-US,en;q=0.9");
                    request.AddHeader("sec-fetch-mode", "cors");
                    //request.AddHeader("referer", "https://www.facebook.com/");
                    request.AddHeader("sec-ch-ua-platform", "\"Windows\"");
                    request.Method = Method.Get;
                    var temp =await Client.DownloadDataAsync(request);  
                    if (temp != null)
                        File.WriteAllBytes(pathfile, temp);
                }
                catch (Exception e) { File.WriteAllText(Environment.CurrentDirectory + "\\Log_DownLoad.txt" , e.ToString() + "\n"); }

            });
            return res;
        }