You can use the built in installer and upgrader, or you can install the plugin
manually.
- You can either use the automatic plugin installer or your FTP program to upload it to your wp-content/plugins directory
the top-level folder. Don't just upload all the php files and put them in
/wp-content/plugins/.
- Activate the plugin through the 'Plugins' menu in WordPress
- Visit your SEO options (Options - All in One SEO) for Wordpress 2.3.x, (Settings - All in One SEO) for Wordpress 2.5.x-2.8.x
- Configure any options as desired, and then enable the plugin
- That's it!
If you have to upgrade manually simply repeat the installation steps and re-enable the plugin.
If upgrading, please back up your database first!
Upgrade guide for upgrading from 1.5.x and below to
1.6.x