Styles demo for 3.0 doesn't work ( https://www.phpbb.com/styles/demo/3.0/index.php )d at the moment, it gives a 500 with in the log;

[Wed Sep 05 09:22:21 2018] [error] [client 91.242.162.37] PHP Warning: include(./../../../customise/db/common.php): failed to open stream: No such file or directory in old/styles/demo/3.0/index.php on line 19
[Wed Sep 05 09:22:21 2018] [error] [client 91.242.162.37] PHP Warning: include(): Failed opening './../../../customise/db/common.php' for inclusion (include_path='.:/usr/share/pear:/usr/share/php') in old/styles/demo/3.0/index.php on line 19

@DavidIQ: Do you want to keep the 3.0 demo? Or can it be removed.