remove some unneeded or broken downloads (closes #4)

index.html

@@ -63,7 +63,8 @@
 
     <div id="msdl-processing-error">
         <h2>Error</h2>
-        <p>An error has occurred while processing your request.</p>
+        <p>An error has occurred while processing your request. Try clicking the use shared session button if reloading
+            the page does not work.</p>
     </div>
 
     <div id="back-to-products">
@@ -71,6 +72,10 @@
         <button onClick="backToProducts();">Go back to the product list</button>
     </div>
 
+    <div id="use-shared-session">
+        <button onClick="useSharedSession();">Use shared session (use if download keeps failing)</button>
+    </div>
+
     <input id="msdl-session-id" type="hidden">
 </body>