.RAR and .ZIP don't really matter in this case. I would suggest downloading WINRAR. I just downloaded my game right now.
This was my result using WINRAR. As you can see nothing is wrong with it. I also ran my game as well inside the RAR file and there is no issue. Unfortunately, I won't be exporting the project to unity nor can I give you the project. It also seems like in picture your trying to open the project via Unreal. That is another reason why it won't work. The project has already been packaged so trying to open it in Unreal won't work. I suggest downloading an extractor like WINRAR. Then you will be able to play the game. Trying to run any executable game that has been packaged in an engine will throw you these kinds of errors. So refrain from trying to run games inside the respective engines or you will get these confusing errors.
Hope this helps,
C&D Cardboard Games