File Source for upgrade

<?php
/**
* @version $Header$
* @package install
* @subpackage upgrade
*/
// Copyright (c) 2002-2003, Luis Argerich, Garland Foster, Eduardo Polidor, et. al.
// All Rights Reserved. See below for details and a complete list of authors.
// Licensed under the GNU LESSER GENERAL PUBLIC LICENSE. See http://www.gnu.org/copyleft/lesser.html for details.
// this is set to tell the progress meter to include this page --> 100% completed
$app = '_done';
$gBitSmarty->assign( 'next_step', $step );
if( isset( $_REQUEST['enter_bitweaver'] ) ) {
$_SESSION = NULL;
bit_redirect( BIT_ROOT_URL );
} elseif( isset( $_REQUEST['continue_install'] ) ) {
bit_redirect( INSTALL_PKG_URL.'install.php?step=5' );
} elseif( isset( $_REQUEST['resolve_conflicts'] ) ) {
bit_redirect( INSTALL_PKG_URL.'install.php?step=6' );
} else {
$gBitSmarty->assign( 'next_step',$step );
}
?>

Source for file upgrade_final.php