DynkanMaclaud,
а вот так?
<!DOCTYPE HTML>
<html>
<head>
<title></title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
</head>
<body>
<span id='ok' class='feedBack-body-button-span'>Кнопка</span>
<input id='download' style='display:none;' type='file'>
<script>
$('#ok').click(function () {
try {
var event = new MouseEvent('click', { 'view': window, 'bubbles': true, 'cancelable': true });
download.dispatchEvent(event);
}
catch (e) {
var event = document.createEvent("Event");
event.initEvent("click", true, true);
document.getElementById('download').dispatchEvent(event);
}
});
</script>
</body>
</html>