Arma 3
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Arma3 Mods and the Arma3 Launcher
By RickOShay
Here's a quick guide on how to manage mods using the Arma3 Launcher.

Mods (modifications) allow you to add non vanilla assets like weapons, vehicles, maps (terrain) and other non standard functionality that are used by mission makers. Many mods are of a fairly high standard and are free to people who own Arma3.

NOTE: Mods can change game functionality - at best they add a lot of additional features. At worst they can destabilize the base game. Be aware of this if you notice a change to FPS or CTD after loading a mod. To troubleshoot simply try deactivating the mod or running the game in vanilla mode (no mods) to ascertain the cause of the performance loss.
 
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Adding and managing Arma3 mods
There are a few ways to load and activate mods in Arma 3 but since Bohemia Interactive has done such an excellent job on the Arma3 Launcher – and since it offers huge advantages over other methods I will concentrate on using the official Arma3 Launcher as the default method.

Arma3 Launcher (BIS)
The Arma3 launcher is installed automatically with the vanilla Arma3 game and makes mod management very easy since it allows you to simply activate mods or groups of mods (called presets) that you have subscribed to via the Steam Workshop or manually installed if downloaded from other sources.

The Launcher opens by default when you start Arma3, select the MODS tab on the LHS. Steam Workshop (SW) mods you have subscribed to have a Steam icon next to them. Local mods do not.

 
How To Install and add Mods to the Launcher
Installing mods for Arma3 is a simple process. From the Launcher's perspective there are two basic types of mods – those that originate from the Steam Workshop and those that come from alternative sources that you have manually downloaded ie 'Local' mods.

Adding Steam Workshop mods to the Arma 3 Launcher (BIS)
To add a Steam Workshop mod simply click on the Subscribe button on the mods Steam Workshop page. The mod will be automatically downloaded and added to the Arma3 Launcher. It’s literally that simple.

Most likely you will add SW mods via the Steam client rather than via a browser or the Launcher. To visit the SW via the Launcher click on the +Steam Workshop button.


Adding Local mods (ie not Steam Workshop) to the Arma3 Launcher (BIS)
To add mods from alternative sources, first download the mod and unpack it using WinRAR (or similar) then place the @modname folder in either your My Documents\Arma3 folder or in C:\Program Files (x86)\Steam\steamapps\common\Arma 3.

Each local mod must have its own folder and ideally follow a consistent naming convention. To help differentiate mods from vanilla Arma3 content - local mod folders have an @ prefix i.e. @CAF or @RHSUSAF. To add a local (non SW) mod to the Launcher click on the [ ]+Local mod icon (top lhs) - then browse to the folder for the mod you want to add.

 
 
Note: The !Workshop folder in C:\Program Files (x86)\Steam\steamapps\common\Arma 3 at the top of the list in the image above. Do not delete or change this folder. This folder contains virtual links to each of the SW mods you have subscribed to and is managed by the Steam client / Arma3 Launcher.

The newly added local mod will now appear in the Launcher mod listing.

Some local mods have a "userconfig" folder, copy it into the Arma3 equivalent folder, usually: "C:\Program Files (x86)\Steam\steamapps\common\Arma 3\userconfig". If there is a key in the mod Keys folder place the key file into the C:\Program Files (x86)\Steam\steamapps\common\Arma 3\Keys folder. The key is used if you run a server.

Updating a local mod requires you to manually download the update then remove the old mod version - then repeat the above process for adding a local mod.

It should be pretty clear by now that Steam Workshop mods are a lot easier to manage - since they are automatically added to the Launcher and more importantly automatically updated.

Encourage mod makers to post their mods onto the SW.

Activating Mods
Ok so now you have installed some SW and Local mods, now activate them. Activation means loading the additional content into Arma3 at start-up. In the Launcher simply click on the checkbox LHS next to the mod you want to activate.

 
Presets and mod dependencies
Most mods live well with other mods – however some mods can cause unpredictable behaviour and can even crash the base game. As a safe guard and so as not to place too much extra load on your systems’ resources it is advisable to load only the mods needed for a particular level or scenario. This is where the preset feature comes in.

Most mod and mission makers will list dependencies that are required. The Launcher will automatically flag mods that have other mod dependencies and even offer to add them for you. Note this only applies to SW mods. You can save a group of mods as a preset. This will allow you to start Arma3 with just the mods you want to use and that are required.

 
 
In the example below I have activated a number of mods I use and saved this mod list as IFA3Lite. To save a list of activated mods click on the PRESET button top RHS – name the preset and click save.

 
Sharing your Preset lists
The Launcher can export a list of mods you use so that you can share them with your squad. To output a Preset file click on the Preset and then click on the share icon (circle with arrows).

 
You will be prompted to save the file. The file will be saved in html format and contain all the appropriate links! Note this applies to SW and local mods. To load a Preset click on the Import button at the bottom of the Preset list or on the …More \/ icon at the top centre of the screen and select import list of mods from a file.

Removing mods
To remove mods click on the mod and then the Unsubscribe (Trash can) icon. This unsubscribes you and deletes the mod folder.

Parameters – Arma3 Launcher
Start-up time can be dramatically improved by skipping the intro and splash screens and only loading mods that you need to use. Also checking the No logs checkbox is also advisable for general use since many mods and Arma3 in general tends to spam the rpt file. See C:\Users\urname\AppData\Local\Arma 3 for the rpt file. Rpt files list all the errors Arma3 encountered during start up mostly relating to loaded mods. Most can be ignored - so don't panic if there are a lot of entries.

Moving mods to save SSD space.
In the Launcher click on the Options button (top RHS) > Launcher Options > Mod Options. Select move and choose an alternative drive and folder for your mods. You can also keep local mods in an alternative location using the watch folder. Pretty self explanatory.

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183 Comments
RickOShay  [author] Feb 15 @ 11:49pm 
Using the Launcher you can also move mods to an alternative location (assuming you have one) -in the event you run out of disk space on the primary drive.
Microfishd Feb 15 @ 8:10pm 
Thank you for your response! Unfortunately, I do not have room for the RHS mod (as required by the RHS KOTH servers), or I would install it.
RickOShay  [author] Feb 14 @ 11:14pm 
@Microfishd The !workshop folder is a symbolic link to the downloaded asset in C:\Program Files (x86)\Steam\steamapps\workshop\content\107410\583496184 - it helps find the Steam asset folder. As it says in the !workshop folder - at the top !DO_NOT_CHANGE_FILES_IN_THESE_FOLDERS

Some mods are very large since they contain a huge number of assets like buildings and maps or vehicles etc. The biggest and arguably some of the best and most useful mods are typically those prefixed with RHS and CUP. I have for example over 100GB of mods I use quite regularly when making missions.

To remove the mod asset simply start the launcher and click the dustbin next to the mod you wish to remove - this will automagically uninstall the mod and unsubscribe you from the mod in the SW.
Microfishd Feb 14 @ 12:14pm 
Why do Steam Workshop mods appear in both the !workshop and workshop content folders?
For example, CUP-Terrains is 8.57 GB at both
C:\Program Files (x86)\Steam\steamapps\common\Arma 3\!Workshop\@CUP Terrains - Core
and
C:\Program Files (x86)\Steam\steamapps\workshop\content\107410\583496184 ?

Is this really 19 GB for one mod?

(I tried deleting a mod from \workshop\content\ and the launcher said the mod was corrupted.)
Thank you for your time.
RickOShay  [author] Aug 27, 2018 @ 2:40am 
@Desperados - that's a feature that's sadly lacking and would add so much to the Launcher and something I've been asking for - for some time!
Desperados Aug 27, 2018 @ 2:05am 
is it possible to launch a steam collection found in the workshop without setting it manually in the presets? How do I add the collection subscribed in the workshop to the presets? Why the collection subscribed in the workshop do not appears automatically in the preset list of the launcher?
RickOShay  [author] Aug 20, 2018 @ 5:31am 
@Finianb1 - Open the Arma3 Launcher click on the mods tab on the LHS - now click on the ... More \ / button at the top middle of the Launcher. Select Import a list of mods from a file. Browse to the html mods file and select it. It will auto subscribe you and download the necessary mods. Once they are downloaded you can make and save a preset as explained above for this mod list.
Shinji Ikari is a Bitch Aug 18, 2018 @ 4:39pm 
How do you import a list of mods you want to activate?
RickOShay  [author] Dec 24, 2017 @ 10:45am 
@x-mike [ GR ] - firstly - if you follow my suggestions you do so at your own risk ok. Don't blame me if it doesn't work or if you need to d/l all mods again. Ok that out of the way - you need to test if vanilla Arma3 still works from it's new location. Assuming it does without error continue reading. Start Arma3 launcher and click Options top Right. In Launcher options > Mod options - click on Move and select the new location where you want the mods to be. Hopefully it will relocate mods from the 107410 folder and recreate the new virtual links. If not I'm afraid you're probably out of luck. The last thing you could try is risky and assumes all games work from new location. Shut down steam. Go to Steam folder delete everything except steam.exe and the Steam apps folder. Now double click steam.exe - steam will rebuild entire db and links.
x-mike [ GR ] Dec 24, 2017 @ 4:44am 
@RickOShay i woulb grateful if you could help me with my problem. I moved my steamapps folder in a new hdd using windows copy-paste method and adding the new location to my steam library. I can see Arma 3 on steam but my subscribed mods show corrupted. I see that steam using virtual links in !workshop and they're broken for me. Every folder shows nothing. Do you have any idea how to fix this without re-download all my mods???
In workshop>content>107410 i can see all my mods in their folders but i can't see how to fix this.