https://www.icyphoenix.com/viewtopic.php?f=26&t=1321&p=10507#p10507
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Mighty Gorgon
Thu 22 Mar, 2007 02:05

Re: Error After Upgrading
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The part you were missing was part of FAP 1.4.0

[quote=FAP 1.4.0 Installation File]#
#-----[ OPEN ]------------------------------------------------
#
includes/constants.php
#
#-----[ FIND ]------------------------------------------------
#
if ( !defined('IN_PHPBB') )
{
	die("Hacking attempt");
}
#
#-----[ AFTER, ADD ]------------------------------------------
#
// Mighty Gorgon - Full Album Pack - BEGIN
define('ALBUM_MOD_PATH', 'album_mod/');
define('ALBUM_FILES_PATH', 'album_mod/upload/');
include($phpbb_root_path . ALBUM_MOD_PATH . 'album_constants.' . $phpEx);
// Mighty Gorgon - Full Album Pack - END[/quote]

So no changes from 1.4.0 to 1.4.1 in that part that was causing you error... am I wrong?