You only installed game, it needs assets. Make sure you followed installation instruction on this page correctly.
Do you have invisible characters (such as EN SPACE or NBSP) in folder path where game is - specifically at the start or the end of some folder name? If so this isn’t bug with the game, this is a bug with .NET/Windows API and you should move game to a different folder. And if that’s not the case I recommend checking if archive you downloaded wasn’t corrupted. If it was I recommend redownloading using download manager.