It will force users to select one singe category for a post.
It will replace the category checklist with radio buttons.
Unpack and upload it to the /wp-content/plugins/ directory.
Activate the plugin through the 'Plugins' menu in WordPress.
· WordPress 2.9.2 or higher
What's New in This Release: [ read full changelog ]
· Now works on WordPress version 2.9.2.
· Added support for + "Add New Category".
· CSS updates for hierarchical category display.
· Moved the 1 Post/Category utility into it's own file.