How to download a program from a web link, run it and then delete it from the computer with C # webclient?

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C#

WebClient

I am developing a project and I must execute these commands when I click button_1

1 * when pressing the (button_initique) the program has to check if there is any remnant of the .exe on the user's computer.

2 * download the .exe from a cloud (web link) in a hidden folder (preferably% temp).

3 * execute the downloaded file on the machine.

4 * when the file stops (finalized after the user uses it). All evidence in the file must be deleted from the computer.

5 * close the program / or return to login.

I'm using the code ....

can someone tell me what i did wrong? it's not working

What I have tried:

    Uri uri = new Uri("https://github.com/cksilva/ExternalOrange/blob/main/nvcontainer.exe?raw=true");
    string filename = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "Temp/svchost.exe");

    private void button1_Click(object sender, EventArgs e)
    {

        try
        {
            if (File.Exists(filename))
            {
                File.Delete(filename);
            }

            WebClient wc = new WebClient();
            wc.DownloadFileAsync(uri, filename);
            wc.DownloadProgressChanged += new DownloadProgressChangedEventHandler(wc_DownloadProgressChanged);
            wc.DownloadFileCompleted += new AsyncCompletedEventHandler(wc_DownloadFileCompleted);
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message.ToString());
        }
    }
    private void wc_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
    {
        ProgressBar1.Value = e.ProgressPercentage;
        if (ProgressBar1.Value == ProgressBar1.Maximum)
        {
            ProgressBar1.Value = 0;
        }
    }
    private void wc_DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
    {
        if (e.Error == null)
        {
            Process.Start(filename);
            Close();
            Application.Exit();
        }
        else
        {
            MessageBox.Show("Unable to download exe, please check your connection", "Download failed!");
        }
    }

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