Internet Explorer 9 download and export PDF images

Cause: IE9 does not support BLOB solution for downloading and exporting PDFS

Solution: Build hidden iframes for download and export

    if (isIE9) {
      const fileHref = http://*****;
      const iframe = document.createElement('iframe');
      iframe.style.display = 'none';
      iframe.src = fileHref;
      iframe.onload = function() {
        document.body.removeChild(iframe);
      };
    }
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