should work

test/dropdowns.js

@@ -47,7 +47,8 @@ function onchangeDropdown(value) {
     }
 }
 
-function onchangeDownloads(value) {
+function onchangeDownloads() {
+    let value = versionObject64[document.getElementById("phase").value][document.getElementById("downloads64").value]
     for (let i = 0; i < value.length; i++)
         document.getElementById("downloads64-box").innerHTML += "<a href=" + value[i].download + ">" + value[i].version + "</a><br />";
 }

test/versions.html

@@ -50,7 +50,7 @@
 				<option value="Beta">Beta</option>
 				<option value="Release">Release</option>
 			</select>
-			<select id="downloads64" onchange="onchangeDownloads(this.value)" hidden><option>Version</option></select>
+			<select id="downloads64" onchange="onchangeDownloads()" hidden><option>Version</option></select>
 			<p id="downloads64-box"></p>
 		</ul>
 		<h1 id="unlimitedmc"> Unlimited Worldgen ("128 bit")</h1>