Hello!
Did I implement it properly? Is there some better way to do this? here's my code

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace HawkEyezxsj
{
    public partial class WND_Main : Form
    {
        WebClient Client = new WebClient();
        int counter = 0;
        public string[] ListOfFiles = File.ReadAllLines("list.txt");
        public WND_Main()
        {
            InitializeComponent();
        }
        private void BTN_GetUpdate_Click(object sender, EventArgs e)
        {
            Client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(Client_DownloadProgressChanged);
            Client.DownloadFileCompleted += new AsyncCompletedEventHandler(Client_DownloadFileCompleted);
            foreach (var item in ListOfFiles)
            {
                Client.DownloadFileAsync(new System.Uri("https://nuno-software.pl/projects/HawkEye/" + item + ""),item);
            }
            Client.DownloadFileAsync(new System.Uri("https://nuno-software.pl/projects/HawkEye/HawkEye_Demo.exe"), "HawkEye_Demo.exe");
            BTN_GetUpdate.Text = "Downloading";
            BTN_GetUpdate.Enabled = false;
        }
        void Client_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
        {
            PRG_Download.Value = e.ProgressPercentage;
                }
        void Client_DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
        {
            counter++;
            if (counter == ListOfFiles.Length)
            {
                MessageBox.Show("The update has been downloaded and applied. The program will be started now.");
                Process.Start("HawkEye_Demo.exe");
                this.Close();
            }
        }
        private void PRG_Download_Click(object sender, EventArgs e)
        {
        }
    }
}