Index: branches/version-2_12-dev/html/install/index.php
===================================================================
--- branches/version-2_12-dev/html/install/index.php	(revision 21864)
+++ branches/version-2_12-dev/html/install/index.php	(revision 21865)
@@ -375,4 +375,8 @@
         umask(0);
         $path = HTML_REALDIR . 'plugin';
+        if (!file_exists($path)) {
+            mkdir($path);
+        }
+        $path = HTML_REALDIR . 'upload/temp_plugin';
         if (!file_exists($path)) {
             mkdir($path);