What happens if you compile for 1.5+ then use the "remove all" button.
After that try and compile for 1.0+ and see what happens.
Also make sure administrator/components/com_export_content/new_version/ is 777
You may also want to check that there are no file ownership issues if your not sure what I mean do a search on the Joomla forums there is plenty of info about it.
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