Free to those who already own the first release of the game.

The Witcher: Enhanced Edition screenshot

CD Projekt has announced that owners of the first release of The Witcher can now download a free update which includes the content from the recently released The Witcher Enhanced Edition.

There's a guide over on the game's official website, but all you'll need to do is download a patch (1GB), download a new version of your language pack (500MB) and finally download the bonus pack (1.2 GB).

That's almost 3GB of of data so you'll probably want to ensure you're using a download manager of some kind.