Saving is disabled in the demo. I think you can still load the auto-save, though. From the topic English Demo No Saving Games???????:
Originally Posted by Lar_q
I have to admit that it was mistake to disable saving in the demo - if I remember correctly the decision was taken because we couldn't guarantee compatibility between savegames in the demo and the full game, but even then, we should've just said that and allowed saving.


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