How To Install Left 4 Dead 2 Mods

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So you want to know how to install Left 4 Dead 2 mods? Sure you do. The Sacrifice has been out for more than a month and we’re betting you’ve already beaten it many times. What’s more, hours and hours of zombie killing via standard campaigns is fun and all, but eventually you’re going to need to get your hands on something new, something you haven’t seen before. Well friend, you’ve come to the right place.

Installing L4D2 mods can be a convoluted process at first, but once you get past the initial clunkiness, it’s actually quite easy. Below, we’ll get you started with the tools you’ll need, and we’ll top it off with a tasty dessert of some of the Left 4 Dead 2 mods we highly recommend. Ready? Great, let’s kill us some Z’s.

Difficulty: Beginner

Table Of Contents



Installing Left 4 Dead 2 Mods

A Few Of Our Favorite L4D2 Mods

Additional Resources


Obviously, before you can even think about playing Left 4 Dead 2 Mods, you’ll need to get yourself a copy of Left 4 Dead 2. For best results, a Steam account is recommended, so if you’re not already using it, now is as good a time as any to change that oversight. Below, we’ll be assuming you’re on Steam, but the instructions should work ok for both. Additional links at the end will help if there’s any overlapping confusion.

System Requirements

Left 4 Dead 2 was released less than a year ago, so your Dell Inspirion from 2003 isn’t going to cut it. Below, here’s what you’ll need in the box just to be able to play:


Operating system: It’s Windows XP, Windows Vista, Windows Vista64 or Windows 7
CPU: Minimum – Pentium 4 3.0 GHz; Reccomended: Intel Core 2 Duo 2.4 GHz
Memory: 1 GB (XP), 2 GB (Vista)
Hard drive space: 7.5 GB
Graphics: Minimum – DirectX 9 compatible video card with 128 MB, Shader model 2.0. ATI X800, NVidia 6600 or better; Reccomended – DirectX 9 compatible video card with Shader model 3.0. NVidia 7600, ATI X1600 or better

You’ll also need .Net Framwork 3.5. That comes standard with Windows 7. Everyone else can get it here. It’s free; just click to download and follow the very easy instructions.


Operating system: Snow Leopard 10.6.4 (Snow Leopard Graphics Update required)
Memory: Minimum 1 GB
Graphics: NVIDIA 8600M / ATI Radeon 2400 or higher


The first thing you need to decide on is whether you want to create custom campaigns or simply play them. Today we’re only going to focus on playing them, but we’ll go ahead and cover all three. If you want to make your own mods, you’ll need L4D2 authoring tools. The Add On Installer and Addon support tools are all you’ll need to actually play.

Ladies and Germs, the tools:

1) WinRar
2) L4D2 Authoring Tools and Add on Support
3) Addon Installer

1) WinRar

This one’s cut and dry. You’ll need WinRar to open most custom L4D2 maps. Get it here.

2) L4D2 Authoring Tools and Add on Support

First, get the the L4D2 authoring tools and the add on support tools; they can be found in one helpful package here. As we’ve already said, for now, the Add On support tool is all you’ll need to actually play L4D2 mods. First, go ahead and download them normally and unzip. (The file is 308.8 MB, not gigantic, but best to check your available space anyway.)

Next up, if you’re on steam, it’s super easy. Go into Steam and open up the Tools tab.

In this section, look for the Left 4 Dead 2 tab, then look for add-on Support. Click to install it. Once installed, you’ll be able to run any L4D2 map, even those made for Left 4 Dead.

The good news is that you only need to activate it once. After installation, it will always run with your copy of Left 4 Dead 2.

3) Addon Installer

Before we get any further, you’ll need to get .Net Framwork 3.5. (You Windows 7 users will have it installed already).

Next up, it’s time to get the Addon Installer ah, installed, So download it here. It’ll save as Just unzip it and run the installer; once it’s finished, you’ll find it under “left 4 dead 2 Add-On Installer” in the Windows start menu.

When you run it, you’ll be asked to set the install folder. You’ll want to be sure it’s put into /steamapps/common/left 4 dead 2. Even so, auto detect should work, and you won’t even need to worry about this.

Install Left 4 Dead 2 Mods

With Addon Installer, you’re really going to have an nice go of installing Left 4 Dead 2 Mods. It’s really, really easy to use. How easy?

Step 1: Find a Left 4 Dead 2 mod you want to use.
Step 2: Download it.
Step 3: Bring up Addon Installer.
Step 4: Make a Mimosa.

Steps one and two will be covered below, so let’s skip to step 3. The add-ons you haven’t yet installed will be available from the “Available” tab.

Here, you can install any add-ons you’ve downloaded, either individually, or in a group. Highlight all the desired files, and select to install. Which brings us to step 4. At this point, you can simply kick back and enjoy that mimosa, because Addon Installer is going to do practically everything for you. Once the installation process is complete, close, then reopen and you’ll see the new Add-on helpfully listed under the “installed” tab for your convenience.

One last thing to keep in mind before you start filling up your computer with delicious zombie-killing delights: If you don’t just LOVE market research, or enjoy tech support, you might want to avoid beta maps. They get a lot of updates, and you’re going to need to do frequent checks for new versions. This is a particular problem if you’re trying to play against someone with a newer version – incompatible versions aren’t able to even recognize each other, and you’ll feel lonely. Then again, Beta is great for seeing, and participating in, the process of making a great concept turn into a great mod.

That aside, everything ready? Good, then the next time you bring up Left 4 Dead 2, you’ll find that you’re able to access the installed mod no sweat. So now that we know how to do it, let’s find some decent Left 4 Dead 2 Mods to install.

A Few Of Our Favorite L4D2 Mods

Diescraper Redux

First, we bring you the winner for Best Horror Movie Title. Diescraper Redux is a 4 map campaign straight out of the second episode of The Walking Dead. You and your fellow players are stranded at the top of some very tall buildings, fighting off wave after wave of undead hordes until rescue arrives. Great premise, and a fun series of maps. Sadly you won’t get the chance to handcuff a skinhead to the roof of a department store, but this is the next best thing.

Grab it Here.

RMS Titanic

RMS Titanic is a still-beta campaign set on the world’s most famous doomed luxury liner. You and 4 friends battle your way deck by deck, slaughtering the undead remains of the poor sods forced to drown in the North Sea so Kate Winslet could survive to make Little Children. It’s still very much a work in progress – the battles are fun, but the graphics aren’t complete, so don’t expect perfection. Yet. Look, this is such a great idea it deserves to make it to final status. Go play and help them get there.

The Quest to kill Billy Zane again can be downloaded here.

Crash Bandicoot Course 2: Electric Wumpaloo

Best. Idea. Ever. Crash Bandicoot Course 2: Electric Wumpaloo is a 4 map Left 4 Dead 2 mod set in the Crash Bandicoot universe. Using Crash Bandicoot characters. Pursuing Crash Bandicoot objectives. In first person. Pure, unadulterated win. Go back in time to the original Playstation by downloading it here.

Indiana Jones and the Temple of Zombies

This kind of thing justifies the existence of modding for all time. Indiana Jones and the Temples of Zombies turned the internet into giggling children a couple of months back. A crazy genius named “Dives” has made a complete, accurate, real-time and totally faithful recreation of the Indiana Jones Adventure: Temple of the Forbidden Eye ride at Disneyland. Including the John Rhys-Davies parts. It’s so incredible, they made it so that you can play the campaign normally, battling zombies through the entirety of the classic ride, or remove the zombies and just ride it like any normal Disneyland patron.

We love it, and strongly suggest you grab a copy for yourself.

Additional Resources:

Team SAO are the major King King bad-asses of L4D. They distributed the Addon Installer, and they’re the guys to visit for any and all questions you might ever have. Definitely bookmark them.

Believe it or not, the Left 4 Dead Wikia is pretty amazing.

If you have any trouble, here’s a handy guide for installing L4D2 mods without Steam.

Finally, just in case you need help with that drink.

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11 Comments on How To Install Left 4 Dead 2 Mods


On November 20, 2010 at 3:00 pm

my left 4 dead 2 addon support always says not aviliable at the moment…….. now what should i do?


On November 20, 2010 at 8:20 pm

Right click-> install. Maybe you may need to reinstall L4D2?

BTW: Greets from SAO! come visit us if you wanna try the NEW V2 Addon installer!!!


On March 11, 2011 at 8:25 am

A confusing set of instructions for us Mac users…here’s what to do to play (don’t ask me about anything more advanced than that) LFD2 add-ons on a Mac:

Download the .vpk file that contains all of that add-on goodness (you may need to unzip it). Then, simply place the .vpk file into this folder on your hard drive:

UserName/Library/Application Support/Steam/SteamApps/common/left 4 dead 2/left4dead2/addons

That’s it!! Run LFD2 and go start a game, select add-ons from the level select screen and your shiny new add-on should be available…

For someone like me, who has just finished all of the campaigns on advanced, but just got owned trying out expert, this gives me plenty more stages to practice my (apparently half-assed) skills on!!! Let’s kill some Z’s (in a slightly chuggy, down sampled Mac kind of a way)!


On July 7, 2011 at 10:43 am

I did everything you said but I can’t find my add-ons on the installer. I tried telling it to look for downloads in the folder I put them in and then refreshed the page but it still didn’t show it.
I tried putting them in the downloads folder the installer comes with and telling it to look for them there but that didn’t work either.
Please Help


On July 7, 2011 at 10:45 am

Nevermind I followed temer’s direction on where to put them and it worked. Thank You


On November 13, 2011 at 6:48 am

I can’t get the installer ?!?!?! It says file not found plz help.


On January 5, 2012 at 4:36 pm

when i double click the add on, it says it has been installed but does not show up in the installer nor the game. some have worked but the rest will not. what am i doing wrong? please and thank you


On March 10, 2012 at 10:28 am

add on installer is another application , you must download it ,,
IT’S not addon-support whitch is in steam.
type in google addon installer


On March 11, 2012 at 12:24 pm

I cant seem to download any of the mods i have.
1.In l4daoi my add ons are in installed but are red and say internet is n/a do you add mods you want to download into the “avaliable” section?
3.i have a pc i put mods directly into add-ons in left for dead fold, they show up in extras-addons but not in a campaign setup menu.
Please help. Thank you


On August 9, 2012 at 4:41 am

Hi i use linux and L4D Works perfect with ubuntu 12_04


On March 15, 2014 at 1:21 am

Why did it says invalid path? XD