JSFiddle - React, Tailwind, and code Playground

HTML

<span class="downloadsleft">5</span><span class="downloadLink">download file</span>

JavaScript

$('.downloadLink').click(function() {
      var currentValue = $(".downloadsleft").text();
      var newValue = currentValue - 1;

      $(".downloadsleft").text(newValue);

      window.open("download.php?file={/literal}{$product.bestandsnaam_hash}{literal}");                

      if (parseInt(newValue,0) == 1)
      {
          location.reload();
      };
  });