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404 error depends from missing ModRewrite module, see details here:
http://www.boonex.net/dolphin/wiki/GenDolTShooter#Q:WhenItrytoopensomebodysprofileIgetthispage:NotFound
About Orca language file - after installation of 6.1 you should compile it via admin panel->plugins->Orca->manage forums section.
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