diff --git a/public/assets/js/csvxmlV2.js b/public/assets/js/csvxmlV2.js
index 4c9333a..f158b0a 100644
--- a/public/assets/js/csvxmlV2.js
+++ b/public/assets/js/csvxmlV2.js
@@ -450,28 +450,48 @@ class CsvxmlPage {
 
     zipUploadToXml(validator) {
 
-        let zip = new JSZip();
+        // Wrap zipping in function to postload it
+        function runZipping() {
+
+            let zip = new JSZip();
+
+            let xmlFiles = validator.generateXml();
+            const serializer = new XMLSerializer();
+            let lineCounter = 0;
+            for (let xml of xmlFiles) {
+                zip.file(lineCounter + ".xml", serializer.serializeToString(xml));
+                lineCounter++;
+            }
+
+            zip.generateAsync({type:"blob"})
+            .then(function(content) {
+                const triggerLink = document.createElement('a');
+                triggerLink.href = window.URL.createObjectURL(content);
+                triggerLink.setAttribute('download', "csvxml.zip");
+
+                triggerLink.style.display = 'none';
+
+                document.body.appendChild(triggerLink);
+                triggerLink.click();
+                document.body.removeChild(triggerLink);
+            });
 
-        let xmlFiles = validator.generateXml();
-        const serializer = new XMLSerializer();
-        let lineCounter = 0;
-        for (let xml of xmlFiles) {
-            zip.file(lineCounter + ".xml", serializer.serializeToString(xml));
-            lineCounter++;
         }
 
-        zip.generateAsync({type:"blob"})
-        .then(function(content) {
-            const triggerLink = document.createElement('a');
-            triggerLink.href = window.URL.createObjectURL(content);
-            triggerLink.setAttribute('download', "csvxml.zip");
+        if (typeof JSZip === "undefined") {
 
-            triggerLink.style.display = 'none';
+            const loadScript = document.createElement("script");
+            loadScript.setAttribute("src", "assets/js/jszip/dist/jszip.min.js");
+            loadScript.addEventListener('load', function() {
+                // console.log("Post-loaded OpenLayers");
+                runZipping();
+            }, {passive: true, once: true});
 
-            document.body.appendChild(triggerLink);
-            triggerLink.click();
-            document.body.removeChild(triggerLink);
-        });
+            document.body.appendChild(loadScript);
+        }
+        else {
+            runZipping();
+        }
 
     }
 
diff --git a/public/index.php b/public/index.php
index db2edde..6704ccf 100644
--- a/public/index.php
+++ b/public/index.php
@@ -40,8 +40,6 @@ echo '
     <meta name="viewport" content="width=device-width, initial-scale=1" />
     <meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
     <meta name="description" content="Validate import CSV files for museum-digital" />
-    <script src="assets/js/jszip/dist/jszip.min.js" type="text/javascript" async defer></script>
-
     <link rel="stylesheet" type="text/css" href="assets/css/csvxml.css" />
     <meta name="theme-color" content="#aa4400" />
     <link rel="shortcut icon" sizes="128x128" href="assets/img/mdlogo-csvxml.svg" />