Hey @erayner! I have a piece of code that redirects the visitor at the form confirmation dialogue. Would that work for you in this case? Simply throw this code into your form confirmation dialogue as a script, with before body end tag as the placement.
<script>
(function(){
// Your URL
var url = 'https://your.urlredirect.com/';
// Delay before the redirect takes place, in seconds
var delay = 0;
window.setTimeout(function() {
window.open(url, '_top');
}, delay * 1000);
})();
</script>
@erayner not sure why you would do this? It would be pretty confusing to the visitor. I would not want to be downloading something in the background and them be re-directed to another url Feels kinda sketch to me. IMHO.
But, @Stefano should work fine.