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sorry you cannot get creative mode on minecraft demo only on the paid version
You'd need to upgrade to the premium version, to remove the restrictions imposed by the demo version.
You can't mod the demo version, so there's no way to add Herobrine.
You can play the demo version or Minecraft Classic on the Minecraft website.
if you're using the demo version any features that are available in the full version, such as creative, are completly legal for that time period.