WordPress released the final version of 3.0 (code named Thelonious) yesterday and we have started upgrading all our blogs. Why should you always upgrade to the latest version. For security reasons, if nothing else.
Every new release of WordPress plugs the security holes that may have existed in the previous version [read how to make your WordPress blog more secure]. So even if you’re not looking for new features, installing the latest version always increases the safety of your blog.
BEFORE UPGRADING make sure you have backed up your existing blog posts, in case something goes wrong (nothing should go wrong, but then, you never know).
Upgrading to WordPress 3.0 (Thelonious)
You can upgrade to WordPress 3.0 in two ways: through your Dashboard and by uploading the files manually. Whenever you log into your Dashboard at the top you’ll be able to read “WordPress 3.0 is available! Please update now.” By clicking the link you can start the upgrade process. If your current version is very old then you may not be able to upgrade to the latest version automatically.
Your web host may also help you upgrade to the latest version. Some web hosts automatically take care of your WordPress updates.
Then launch your FTP program and go the folder where you’ve installed your WordPress blog. Assuming you are using FileZilla, the left hand side window contains your local files and the right hand side window contains the file on the remote server. Go to the folder (on the left hand side) where you have uncompressed the WordPress files.
Select all but LEAVE wp-content and wp-config.php in case it exists. This is because wp-content contains your themes and plugins — overwriting this will completely destroy your current blog layout and other settings. wp-config.php contains settings that connects your blog to your MySQL database.
On the right hand side, go to the folder where you have installed your blog. Upload the new files.
Then in your browser window, type http://yourdomain.com/yourblog/wp-admin/upgrade.php and press Enter. If you have installed your blog in the root folder you can simply use http://yourdomain.com/wp-admin/upgrade.php.
It’ll ask you to update your database and let it do. That’s it. Once you have followed these steps you have upgraded to WordPress 3.0.