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1. Unzip this package in an empty directory.
2. Using you favorite FTP client, upload those files to your plugins directory onto your server. It should be : /your-wordpress-root/wp-content/plugins/
3. Go to your Administration panel, in the Plugins section, and activate mCatFilter.
4. You're done !

Upgrading from any previous version

Follow these steps if you are not using the automatic update tool provided by WordPress 2.5+

1. Go to your Administration panel, in the Plugins section, and deactivate mCatFilter.
2. Replace all mCatFilter files by those of your installation package.
3. Go to your Administration panel, in the Plugins section, and activate mCatFilter.
4. You're done !