On Monday, November 25, 2008, WordPress version 2.6.5 was released to the public. For information on the security and bug-fixes in this version, see Changelog for 2.6.5. You can view the differences here.
For Version 2.6.5, the database version (db_version in wp_options) remained at 8204.
To download WordPress 2.6.5, visit http://wordpress.org/download/release-archive/
For step-by-step instructions on installing and upgrading WordPress:
If you are new to WordPress, we recommend that you begin with the following:
wp-admin/users.php wp-content/plugins/akismet/akismet.php wp-includes/feed.php wp-includes/post.php wp-includes/version.php xmlrpc.php