I am not sure if I understand your English.

execute in software is the meaning of running or starting or computing the software. The files themselves that are started are called executeables. Contrary to data files. Those are not executed, but being read and operated on by those executeables.

But all this has nothing to do with the price of a game. You pay for the project. Or not. All files are available that the page tells you that will be available when either paying or going to the download page of a free/pay what you want game. Of course you should download the versions that have the icon of your operating system. And read the text too, sometimes that clarifys what is what.