I'm not sure I understand your question, but I'm using windows 10 with unityplayer.dll.
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That answers it! You're on PC.
Can you try the download on more time? The version I originally released for PC had a bug, but I updated it yesterday afternoon. If that still doesn't work, can you send me a screenshot of what the folder looks like when you open it / what happens when you try to open the game?
Thanks and sorry for the trouble!