I’ve downloaded The Beast Within demo and decided to post the download information here because this is the demo section 
I got the download link from ATMachine who is an regular poster on adventuregamers.com. The demo was uploaded to the website of Hendroz who is responsible for the amazing Gabriel Knight patches. Check out his website for more information: http://www.gabrielknight2k.tk
Sorry about this shameless plug but Hendroz did some amazing stuff
I haven’t tried the demo yet because I’m at work…
The Beast Within demo contains the original artwork which unfortunately did not make it in the final version. If the demo crashes in XP be sure to use the supplied 300.aud file. This file will hoever disable the music…
The download links:
Demo: http://vogons.zetafleet.com/gkpatches/demos/gk2demo.zip
Aud file: http://vogons.zetafleet.com/gkpatches/demos/300.AUD
Enjoy!