Using the terminal go to the root folder of your moodle instance. Test Do a grep for 'coursecat_sortable_records' grep -R coursecat_sortable_records Confirm that the only results are in lib/upgrade.txt (notes about the deprecation and removal of the coursecat_sortable_records class) Do a grep for 'coursecatlib.php' (make sure the removed file is not included anywhere) grep -R coursecatlib.php Confirm that the only result is in lib/upgrade.txt.