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Hikari Category Permalink requires at least WordPress 3.0 and PHP5 to work. It has backward compatibily for WordPress 2.8 and 2.9, but they are deprecated and I don't support them officially. Setting category permalink also requires JavaScript enabled.

If you have Dmytro's sCategory Permalink plugin installed, first deactivate it. Hikari Category Permalink doesn't conflict with the legacy plugin, but I don't recommend keeping both activated.

Once you are ready to install, you can use the built in installer and upgrader, or you can install the plugin manually.

1. Download the zip file, upload it to your server and extract all its content to your /wp-content/plugins folder. Make sure the plugin has its own folder (for exemple /wp-content/plugins/hikari-category-permalink/).
2. Activate the plugin through the 'Plugins' menu in WordPress admin page.
3. Go to Settings > Permalink, select "Custom Structure" and set any structure you'd like, using the %category% tag. For an exemple, you can use /%category%/%post_id%/%postname%/.
4. There's no option to be configured. Just try to edit any existing post or create a new one.
5. When you hover mouse in a category in the "Categories box", you'll see a blue "Permalink" text appear on the right of the hovered category, just click on that text to set that category to be used in this post permalink. (You need JavaScript enabled to see the "Permalink" text appear)

Upgrading

If you have to upgrade manually, simply delete hikari-category-permalink folder and follow installation steps again.

If you are using Dmytro's sCategory Permalink plugin, just deactivate it and activate Hikari Category Permalink. And once the upgrade is done, if you are using WordPress 3.0 or above, go to Settings > Permalink and replace legacy %scategory% tag to stantard %category%!

Uninstalling

To uninstall just deactivate the plugin, or delete its folder.

There's no wp_options option stored, posts category permalinks are stored as postmeta. Currently there's no automatic way to delete these postmeta if you don't need them anymore, this feature will be added in a future release.