# Add modules to a Unity Editor installation

> Modules are optional components you can use to tailor your Unity Editor installation; they contain build support for certain platforms, language packs, and developer tools.

You can select modules during a new Editor installation, or add modules to existing installs.

You can limit the file size of the Editor if you select only the modules that you require.

## Add modules to a new install of an Editor

When you install a new Editor, you can choose to install modules as part of the Editor installation process. For more information, refer to [Install the Editor](./add-editor#install-the-editor).

## Add modules to an existing Editor installation

To add modules to an existing Editor installation:

1. Open the Hub.
2. Select **Installs** in the left sidebar.
3. Navigate to the Editor version you want to add modules to, and select **Manage**.
4. Select **Add modules**.
5. A window opens with all the available modules for the selected Editor. Choose the modules you want to install, and then select **Install**.
6. The Hub starts downloading the modules, and you can view the progress in the [Downloads window](./add-editor#downloads)


**The Add modules window:**
![The Add modules window](/api/media?file=/hub/media/images/installs-manage.png)

> **Important:**
>
> You can only add modules to Editor installations that were installed with the Hub. If the **Add modules** option is missing for an Editor installation, this usually means the Editor was installed without the Hub. To add modules to an Editor version that was installed without the Hub, you must uninstall the Editor and then reinstall it through the Hub. You can also install an Editor and modules via the Hub command-line interface. For more information, refer to [Hub command-line reference](./hub-cli).