Maybe the files weren't properly unzipped. Can you tell me how you extracted them? And all the files and folders would go into the games folder, putting them into the voices folder wouldn't work.
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I downloaded the files again to make sure. For explanation: I play the game on a windows PC. I unzipped it with winrar and copied the rpy files into the game folder. Then I copied the three voice folders into the game folder too. Well, like I wrote, it is a pity but not a desaster. Your game is still amazing.