All total, the game would cost you $31.45 on Steam — which isn’t terrible. But free is obviously better.
To grab the bundle, you’ll want to go to the page for one of the above listed games. Scroll down and ignore the “Add to Cart” button. You’re going to want the “Install Game” button under the “Packages that include this game” section. Don’t worry, you only have to do this once. Clicking the install button will automatically add the entire bundle to your library.
Keep in mind, I’m not sure of the expiration date on this deal — although I can’t imagine it lasting past this weekend. So if you want to take advantage of it. You’ll want to do so now.