Index: branches/RC/core/install/install_toolkit.php
===================================================================
diff -u -r11504 -r11610
--- branches/RC/core/install/install_toolkit.php	(.../install_toolkit.php)	(revision 11504)
+++ branches/RC/core/install/install_toolkit.php	(.../install_toolkit.php)	(revision 11610)
@@ -99,14 +99,21 @@
 		 */
 		function CheckPrerequisites($module_path, $versions, $mode)
 		{
+			static $prerequisit_classes = Array ();
+
 			$prerequisites_file = sprintf(PREREQUISITE_FILE, $module_path);
 			if (!file_exists($prerequisites_file) || !$versions) {
 				return Array ();
 			}
 
-			include_once $prerequisites_file;
+			if (!isset($prerequisit_classes[$module_path])) {
+				// save class name, because 2nd time
+				// (in after call $prerequisite_class variable will not be present)
+				include_once $prerequisites_file;
+				$prerequisit_classes[$module_path] = $prerequisite_class;
+			}
 
-			$prerequisite_object = new $prerequisite_class();
+			$prerequisite_object = new $prerequisit_classes[$module_path]();
 			if (method_exists($prerequisite_object, 'setToolkit')) {
 				$prerequisite_object->setToolkit($this);
 			}
@@ -554,7 +561,7 @@
 				$fields['description'] => $description, 'Status' => $status,
 			);
 
-			$category_fields['ParentId'] = $this->Application->findModule('Name', 'Proj-CMS', 'RootCat');
+			$category_fields['ParentId'] = $this->Application->findModule('Name', 'Core', 'RootCat');
 
 			if (isset($category_template)) {
 				$category_fields['Template'] = $category_template;
@@ -580,7 +587,10 @@
 		{
 			$this->Application->removeObject('c-cdata');
 
+			// recreate all fields, because custom fields are added during install script
 			$category->defineFields();
+			$category->prepareConfigOptions(); // creates ml fields
+
 			$category->SetDBField('cust_' . $prefix  .'_ItemTemplate', $item_template);
 			$category->Update();
 		}