Enabling gore in the censored Aussie versions of the L4D2 demo is as easy as editing 1 character in 2 text files:
Change the app id 590 to 510 in these two files:
Save them and run the left4dead2.exe executable directly (not through steam icon/games list). This should be located in a directory like C:\Program Files\Steam\steamapps\common\left 4 dead 2 demo, just like the first file above.
Your status will say that you're playing "Left 4 Dead Dedicated Server", but the L4D2 Demo will start and you'll be able to play with gore enabled (no more disappearing zombies, more blood, decapitations/dismemberment, splatter on the screen, etc.!)
You will also still be able to start lobbies, invite friends and join games in progress on servers.
Thanks to Santos for mentioning this to me so that I could try it out - it works well!Edited 3 times, last edited 10/11/09 - 7:42pm
Posted on Friday, 30th October 2009