The InstantUpgrade plugin downloads the latest WordPress version from the WordPress server and unpacks it at your server. In the next step, it deletes all of your old WordPress files (except wp-content/ and wp-config.php) and puts the new files into your WordPress directory. Finally, it runs the database upgrade script. That procedure is exactly what the official guide proposes, only 30 times faster and with you leaning back.<br>
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Visit <a href="http://www.zirona.com/software/wordpress-instant-upgrade/" target="new">Plugin Homepage</a>