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I want to watch some duels downloaded from . It would be grand to see vo0 in action.

So I've copied required maps and demos, but when I type in demoplay <DEMONAME>, I can see that the game is loading and maybe just one frame from the level is shown and then I'm back in the menu.
I tried newest demos, from 2005.

Is there something I can do?
This question / problem has been solved by StabbingHoboimage
You've got PK++, right?
Thanks! It seems pk++ was required.