There is a <noscript> element for the reCAPTCHA field, it's an <iframe>, it'll take you to a page with audio links.
- Select Get an audio challenge.
- Select Can't hear the sound? below the [EMBED] text.
- Save the MP3 file, preferably under a new name.. something not a large hash sequence.
- Listen to the file, many times.. enter the numbers into the form, say you're human.. copy/cut the code below You're a human! Please...
- Paste/type it onto the daemonforums registration form.
It's far from easy, actually it's crazy hard.. but it really should work.
Hope that helps.