Hello! You have to extract all the files from the zip on the same folder. If you are doing so, it may be an antivirus deleting the UnityPlayer.dll and that's why you are getting an error. If you download the game from the site you will get the zip and you will be able to see the UnityPlayer.dll inside. Let me know if some of this helps you finding a solution, if not, please write me again and I can keep looking!