download the file from either one. Once your file is downloaded, you right click it and select "extract here". I don't know if it's the exact same for Mac, but that's what I do for Windows.
I confirm for Mac : first, download it (Mega works, not the other one) ; then unzip the downloaded file ; and after that, move it inside the directory where you already have the first chapter of the second season, and then you will be able to launch the game.
