Question: I am trying to make one form which give functionality like when user enter name and email,then PDF file starts download automatically.

And while i am applying this code in additional setting tab on submit button,it replay the error message like this.

I am currently working in local machine, i know error is in contact form 7 mail tab,but don't know how to fix it?

"There was an error trying to send your message. Please try again later."

Here is my contact form 7 code:

```
<label> Name
    [text* your-name] </label>

<label> Email 
    [email* your-email] </label>

[submit "Download Now"]

```

Here is code that i write in Additional Setting for download PDF file directly when form is submitted

```
on_sent_ok: "location = 'http://localhost/wordpress/wp-content/uploads/2017/08/pdf-sample.pdf';"

```

Answer: 
If someone is looking for an up-to-date answer since `in_sent_ok` is being deprecated, instead we can use: 

```html
   <script>
    document.addEventListener( 'wpcf7mailsent', function( event ) {
    location = 'http://example.com/';
    }, false );
    </script>
```
the following code is working for me: I made it with javascript

```
function force_download( file ) {
    pdf = window.open(file, '', 'left=100,screenX=100');
    pdf.document.execCommand('SaveAs', 'null', 'myfile.pdf');
    pdf.close();
 }
 on_sent_ok: "force_download('pdf_url_here');"

```