Add Click event to my dynamically created Xaml Button

I'm currently writing a function that creates button in XAML (on runtime) according to JSON information that is received from an API call in C#.

I currently have the following code:

Button downloadButton = new Button();
downloadButton.Click += new RoutedEventHandler(DownloadContent);

But I get the following error:

An object reference is required for the non-static field, method, or property 'Mainwindow.DownloadContent(object, RoutedEventArgs)'

I've tried changing it to downloadButton.Click += new RoutedEventHandler(this, DownloadContent); but that gives me the error:

Keyword 'this' is not valid in a static property, static method, or static field initializer

For reference this is what DownloadContent looks like

private void DownloadContent(object sender, RoutedEventArgs e)
{
    WebClient webClient = new WebClient();
    webClient.DownloadFileAsync(new Uri("API-URL"), contentZip);
    webClient.DownloadFileCompleted += new AsyncCompletedEventHandler(InstallContent);        
}

This is what I want the button to look like (skipping the other stuff like background color, etc.)

<Button Name="Downloadbutton" 
  Content="Download"
  Click="DownloadContent"
</Button>

Am I missing something as why I get this Error and how could I fix it?

EDIT

The Installcontent function looks like this:

private void InstallContent(object sender, AsyncCompletedEventArgs e)
{
    ZipFile.ExtractToDirectory(contentZip, contentPath, true);
    File.Delete(contentZip);
    writeJsonData(DLCbuttonTag);
    Downloadbutton.Visibility = Visibility.Collapsed;
    Uninstallbutton.Visibility = Visibility.Visible;
}

The function that creates the button:

public static void getContentList()
        {
        string jsonString = File.ReadAllText(@"C:\Users\stage\OneDrive\Documenten\ContentInfo.json")
        ContentList contentList = JsonConvert.DeserializeObject<ContentList>(jsonString);;

            for (int i = 0; i < contentList.Content.Count; i++)
            {
                    StackPanel dynamicStackPanel = new StackPanel();
                    dynamicStackPanel.Orientation = Orientation.Horizontal;
                    dynamicStackPanel.Background = Brushes.Transparent;
                    
                    Button downloadButton = new Button();
                    downloadButton.Click += new RoutedEventHandler(DownloadContent);
                    dynamicStackPanel.Children.Add(downloadButton);
            }
        }