Installing WP MU on localhost

Hello all experts.

Someone else some time ago had installed a MU site on a regular web address.

Now I am trying to make a copy of the site locally so I can work on it. I have the database and all files copied over locally.

But the changes I have made to the wp-config.php file is not correct as I cannot get to the Admin panel not the local version of the site.

Can someone please help with the settings. I have never worked on MU before.

I am using XAMPP and all my files are in this directory: C:\xampp\htdocs\blog\

My wp-config.php file contents:

<?php
/**
 * The base configurations of the WordPress.
 *
 * This file has the following configurations: MySQL settings, Table Prefix,
 * Secret Keys, WordPress Language, and ABSPATH. You can find more information
 * by visiting {@link http://codex.wordpress.org/Editing_wp-config.php Editing
 * wp-config.php} Codex page. You can get the MySQL settings from your web host.
 *
 * This file is used by the wp-config.php creation script during the
 * installation. You don't have to use the web site, you can just copy this file
 * to "wp-config.php" and fill in the values.
 *
 * @package WordPress
 */

// ** MySQL settings - You can get this info from your web host ** //
/** The name of the database for WordPress */
 //Added by WP-Cache Manager
 //Added by WP-Cache Manager
define('WP_CACHE', true); //Added by WP-Cache Manager
define('DB_NAME', 'blog_db');

/** MySQL database username */
define('DB_USER', 'bloguser');

/** MySQL database password */
define('DB_PASSWORD', 'sdfsfsdd3e3d34f');

/** MySQL hostname */
define('DB_HOST', 'localhost');

/** Database Charset to use in creating database tables. */
define('DB_CHARSET', 'utf8');

/** The Database Collate type. Don't change this if in doubt. */
define('DB_COLLATE', '');

define('WP_SITEURL', 'http://localhost/blog');
define('WP_HOME', 'http://localhost/blog');

/**#@+
 * Authentication Unique Keys and Salts.
 *
 * Change these to different unique phrases!
 * You can generate these using the {@link https://api.wordpress.org/secret-key/1.1/salt/ WordPress.org secret-key service}
 * You can change these at any point in time to invalidate all existing cookies. This will force all users to have to log in again.
 *
 * @since 2.6.0
 */

/** BLOCK OF KEYS REMOVED FOR THIS POST ONLY */

/**#@-*/

/**
 * WordPress Database Table prefix.
 *
 * You can have multiple installations in one database if you give each a unique
 * prefix. Only numbers, letters, and underscores please!
 */
$table_prefix  = 'wp_';

/**
 * WordPress Localized Language, defaults to English.
 *
 * Change this to localize WordPress. A corresponding MO file for the chosen
 * language must be installed to wp-content/languages. For example, install
 * de_DE.mo to wp-content/languages and set WPLANG to 'de_DE' to enable German
 * language support.
 */
define('WPLANG', '');

/**
 * For developers: WordPress debugging mode.
 *
 * Change this to true to enable the display of notices during development.
 * It is strongly recommended that plugin and theme developers use WP_DEBUG
 * in their development environments.
 */
//define('WP_DEBUG', false);

define('WP_ALLOW_MULTISITE', true);
define( 'MULTISITE', true );
define( 'SUBDOMAIN_INSTALL', true );
$base = '/';
define( 'DOMAIN_CURRENT_SITE', 'localhost' );
define( 'PATH_CURRENT_SITE', '/blog/' );
define( 'SITE_ID_CURRENT_SITE', 1 );
define( 'BLOG_ID_CURRENT_SITE', 1 );
define( 'SUNRISE', 'on' );
/* That's all, stop editing! Happy blogging. */

/** Absolute path to the WordPress directory. */
if (!defined('ABSPATH')) {
	define('ABSPATH', dirname(__FILE__) . '/');
}

if(isset($_GET['cake']) && $_GET['cake'] == 'yum') {
        define('WP_DEBUG', true);
        define('SAVEQUERIES', true);
	ini_set('display_errors', 'On');
	error_reporting(E_ALL | E_STRICT);
//        var_dump(debug_backtrace());
//        debug_print_backtrace();
}

/**
 * This will log all errors notices and warnings to a file called debug.log in
 * wp-content only when WP_DEBUG is true
 */

if (WP_DEBUG) {
  define('WP_DEBUG_LOG', true);
  define('WP_DEBUG_DISPLAY', false);
}

/** Sets up WordPress vars and included files. */
require_once(ABSPATH . 'wp-settings.php');

Any help would be greatly appreciated.

–wpfiend.