You don't need to copy/move them. In the editor you go to Scenario\Scenario properties. In the area named something with "scenario folders" you add "..\extras\Prehistoric" and add the units as normally.
Hope this helps
To add on to what mrtn said, you almost never need to copy units from where they are installed if you use that technique. Besides units it applies to nearly any files in the art or extras subdirectories.
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