I used the code that Perp provided (thank you!) and made sure that my file was named correctly. When I'm viewing the page as a visitor, it doesn't start a download. It just opens a new tab. I need it to download because this form does not have the same functionality when viewed with browser's automatic pdf viewer.
Here's the code updated to reflect my file name:
<script>
var link = document.createElement('a');
link.href = '/s/ca81622nd.pdf';
link.download = 'ca81622nd.pdf';
link.dispatchEvent(new MouseEvent('click'));
</script>
Am I missing a step somewhere? If not, anyone know how to do this? I don't need it to be a part of a form. I'm just not sure how to create a download link in squarespace.