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When I try to run it, an error message pops up saying that "UnityPlayer.dll" is missing.

I'm having the same error.  Could be an issue with the build settings in Unity.

Same

Uh oh, I'll upload another build. I might try a WebGL build so that you don't need to download anything. 

(+1)

I've uploaded a WebGL build which seems to be happier. Let me know how it goes!