I do not have to much experience with Magento,specially with Magento upgrade. One client want to upgrade from EE 1.7 to EE 1.14. I fix most of the problems but catalog filter from left nav search is not working. I got error 404 Not Found catalogsearch/filtered/index. In the old version in Core/Mage exits controller CatalogSearch/controllers/FilteredController.php. In new version this controller is not exist. I perform research more then one day and I cannot find anything. Please help .
If you are using Magento 1.7.x, why dont you try and use our extension, it should fix this problem for you automatically.