- After extraction you should have the `@ace` and `@CBA_A3` folders inside your Arma 3 folder.
## 4. Install ACE3 Optional components
<divclass="panel callout">
<h5>Note:</h5>
<p>Skip this step if you're not using additional mods. If you are, consult with your mission maker before installing any of these components. If you are a mod creator, please visit the <ahref="{{site.baseurl}}/wiki/development/modularity-and-pbo-structure.html">Modularity and PBO Structure</a> page for more information.</p>
</div>
### 4.1 What do they do?
Optional components supplement 3rd party mods with ACE3 features, for example:
- Optional weapon components make [Advanced Ballistics]({{site.baseurl}}/wiki/feature/advanced-ballistics.html) possible, as well as the ability to use ACE3 weapon attachments with 3rd party weapons like RHS, HLC, etc.
- Optional tracers component brings back ACE2 ball tracers.
- Optional server component is used to load the userconfig files.
### 4.2 Which optionals should I use?
Only use the optional components that correspond with your mod-pack.
### 4.3 How to install these components?
- Inside your `Arma 3\@ace\` folder, you'll find the `optionals` and `addons` folders.
- Inside the `Arma 3` folder create a new folder e.g. `Arma 3\@ace_optionals\` and a subfolder `Arma 3\@ace_optionals\addons`
- Copy and paste the relevant `.pbo` and `.bisign` files from the `Arma 3\@ace\optionals` folder into the `Arma 3\@ace_optionals\addons` folder.
#### 4.3.1 Alternative method to install optionals
- Inside your `Arma 3/@ace/` folder, you'll find the `optionals` and `addons` folders.
- Copy and paste the relevant `.pbo` and `.bisign` files from the `optionals` folder into the `addons` folder.
- Copy and paste the `userconfig` folder from the `optionals` folder into root `Arma 3` folder.
## 5. Launch Arma 3 with ACE3
- Launch Arma 3 to start the official game launcher.
- Click `Mods` and make sure the checkboxes next to `ace` and `CBA_A3` are ticked.
- Inspect `Addon Options` and verify the `Addon Search Directories` are leading to your Arma 3 folder.
- Return to the `Addons` tab and click `Refresh`.
- Right-click inside `Addon Groups`, click `Create Group` and give it a name.
- Drag and drop `@ace` and `@CBA_A3` from `Available Addons` into the new Group you created inside `Addon Groups` and make sure the checkboxes are ticked.
