This script does not exist in version 1.31.12
Topic on Manual talk:PopulateContentTables.php
I guess you are asking because of this comment. I believe you have to update the code to 1.35.x, run this script and only after this "update.php".
I guess you are asking because of this comment. I believe you have to update the code to 1.35.x, run this script and only after this "update.php".