Seems to me that you're missing Conf_Global Try creating a file called conf_global.php and in here, enter the following: <?php
$INFO = array (
'sql_host' => '',
'sql_database' => '',
'sql_user' => '',
'sql_pass' => '',
'sql_port' => 3306,
'sql_socket' => 'MySQL',
'sql_tbl_prefix' => '',
'sql_utf8mb4' => false,
'board_start' => ,
'installed' => false,
'base_url' => '',
'guest_group' => ,
'member_group' => ,
'admin_group' => ,
); Then visit your base URL and it should run the installer. Let me know if you have any issues with this :)