That's weird... What OS are you using? Maybe try to re downloading it.
I'm on windows 7 and no matter what I do it just keeps saying that the unityplayer.dll is missing even when I tried downloading it seperate and moving it into the system directory.
Well we didn't get to test on 7 so not sure if that is it or not :/ Maybe this could help? https://answers.unity.com/questions/1425830/the-program-cant-start-because-unity...
