Index: includes/install.inc
===================================================================
--- includes/install.inc	(revision 70)
+++ includes/install.inc	(working copy)
@@ -571,6 +571,7 @@
 function install_goto($path) {
   global $base_url;
   header('Location: '. $base_url . '/' . $path);
+  header('Cache-Control: no-cache'); // Not a permanent redirect.
   exit();
 }