If the idiot insists on using IE11 here is a script to try.
<script>
var $buoop = {required:{e:-4,f:-3,o:-3,s:-1,c:-3},insecure:true,api:2020.09 };
function $buo_f(){
var e = document.createElement("script");
e.src = "//browser-update.org/update.min.js";
document.body.appendChild(e);
};
try {document.addEventListener("DOMContentLoaded", $buo_f,false)}
catch(e){window.attachEvent("onload", $buo_f)}
</script>
Found here.
https://browser-update.org/#install