Add a mass click trigger to many links and insert that links url into the popup forms field, then on submission redirect to specific url.

custom-mass-link-trigger.js

// Customize the click selector (.pdf-link). Elements targeted by this script should not be set up as normal click triggers.
// This effectively acts as the click trigger.
jQuery(document).on('click', '.pdf-link', function (e) {
  
  var popupID = 123, // Popup ID #
      linkFieldName = 'link_field_name_attr', // Form field name="" value.
      // Stop editing below this line.
      // ---------------------------------------
      $popup = PUM.getPopup(popupID), // Change this to your popup ID.
      $i
      $this = $(event.target);
  
  e.preventDefault();

  // If the popup is already open return.
  if ($popup.popmake('state', 'isOpen')) {
    return;
  }

  // If cookie exists or conditions fail return.
  if ($popup.popmake('checkCookies', {cookie_name: 'pum-'+popupID}) || !$popup.popmake('checkConditions')) {
    return;
  }

  // Set the global last open trigger to the a text description of the trigger.
  $.fn.popmake.last_open_trigger = $this;

  // Set the value of hidden NF field to the clicked links url.
  $popup.find('[name="'+formInputName+'"]').val($this.attr('href'));

  // Open the popup.
  $popup.popmake('open');
});

form-confirmation.html

<script>
setTimeout(function() {
  window.location = "{{link_field_value}}"; // Output the value of the field used in your code above into the script to redirect.
}, 3000); // Change this to delay the redirect/download. Currently 3 seconds.
</script>