Left 4 Dead was released for the Mac on October 28, 2010. The popularity of the game led to the development of a sequel, Left 4 Dead 2, which was released on November 17, 2009. A new map for both Left 4 Dead and Left 4 Dead 2, called 'The Sacrifice', was released on October 5, 2010. Navigate to your steam library, right click on Left 4 Dead 2, select properties and go to local files.Click on Verify integrity of game files Steam will check for missing files.

I don't know about the 13 inch model. That machine is known for having less-capable graphics hardware. Of course, L4D2 isn't exactly a cutting-edge game, either, and it's based on an engine that was used in older games as well. (Not that I mean that as an insult, I think that all of Valve's games based on that engine are great... the graphics are quite good, the physics are great and, most importantly, the gameplay is awesome.)

Here's what its system requirements are:

OS: MacOS X 10.6.4 or higher (Snow Leopard Graphics Update required)

Processor: Dual core Intel processor, 2GHz or better

Video Card: ATI Radeon 2400 or higher / NVIDIA 8600M or higher / Intel HD Graphics 3000

Not supported: OS X 10.5.x, ATI X1600 or X1900 graphics, NVIDIA GeForce 7 graphics or Intel graphics less than Intel HD 3000

That does seem to include your machine, so it may be worth a try.

Oct 20, 2012 7:49 AM

One of the giants of CO-OP gaming is now available completely FREE for Mac OS X computers. Download now Left 4 Dead 2 Mac OS X FREE and start your own battle against the hordes of zombies. This game is the sequel to the Left 4 Dead, the first title in the Valve‘s series. It’s one of the few games that has 5 star reviews on Steam and other stores. This means that the players really love this game. A “Game of The Year” Edition has been released after a certain time. This version contains all the additional content, DLCs and Add-ONS, all gathered together to build a great game. So, if you want to have Left 4 Dead 2 Game Of The Year Edition on Mac OS, proceed now to the download section and get your own copy.

If you want a true CO-OP game to play with your friends, Left 4 Dead 2 OS X – Game Of The Year Edition is definetely the perfect one for you! It features five game modes, each with its own settings and gameplay, designed to fit different tastes of players. The modes are:

• Campaign
• Singleplayer
• Versus
• Survival
• Scavange

Left 4 Dead 2 Mac OS X Free is available for everyone in .dmg format. This means that it will be very easy to get it on your computer. Just open the file and copy all the content from it into a folder (created by you) from your computer. Then search for the file “Left for Dead Launcher” and run it. This game has been tested on three different computers and worked like a charm, so if you have problems please double check if you are doing everything good. You can also contact us if you think we can help you. Enjoy!

Left 4 Dead 2 for macOS
~ Minimum System Requirements ~

Left For Dead 2 Macbook Air

NOTE: This game is FREE TO DOWNLOAD, but in order to get acces to this game you need to create a FREE account (more details on the download page). By this way you can download all the DLC packs for this game and a lot more games and softwares for your Macbook/iMac.