Nevermind, I found the answer. I'll write it here for my and anyone else's reference:
<p>Downloaded <span id="number">0</span> times!</p>
<script type="text/javascript">
var i = 0; // Value starts off at zero
function increment() {
i++; // Change to i += [yourvalue] for any increase other than 1
document.getElementById('number').innerHTML = i;
}
setInterval('increment()', 2000); // Increments every 2 seconds
</script>
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