Maybe just a typo in your post but correct folder name is Voice not voices.
Make sure the .VPM and .UNL files have the exact same name (apart from the file extension of course).
For instance: DarthVader.vpm and DarthVader.unl
Also make sure the Windows Explorer of your computer is set to "show file extensions of known file types".
I have a n�vi 1490T on which these voices work fine.
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