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Installation on your projects

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To get up and running fast, please refer to the Getting started instructions.

The LLMAI plugin is distributed with C++ source code. This gives you the option of changing or adding features if you want. That is entirely optional and not required to have full functionality in the Blueprint and event system the plugin already provides to your projects.

Blueprint project installation steps​

After purchase on Fab.com, go to your Fab library in the Epic Games Launcher, click Install to Engine, pick your UE5 version, and it lands in the engine's Plugins folder (for example C:\Program Files\EpicGames\UE_5.x\Engine\Plugins\Marketplace).

Close your project and reopen it. Go to Edit → Plugins, find or search for LLMAI, and click to enable it. You will now have a new LLMAI section under Edit → Project Settings → Plugins → LLMAI. See Configuration quick-start for setting up OpenAI, Grok, and LocalAI for your project.

C++ project installation steps​

Optional — advanced users only

Only follow these steps if you need plugin C++ source in your project. For standard Blueprint use, the Blueprint project installation steps above are sufficient.

Step 1: Copy from engine and regenerate​

  1. Use Install to Engine from your Fab library in the Epic Games Launcher (same as the Blueprint flow above)
  2. Copy the LLMAI folder from the engine Plugins directory into your project's Plugins/ folder (for example from Engine\Plugins\Marketplace\LLMAI to YourProject\Plugins\LLMAI):
YourProject/
└── Plugins/
    └── LLMAI/          # Complete plugin folder here
  1. Right-click on your Unreal project's .uproject file and click Generate Visual Studio project files
  2. Open the .sln in Visual Studio and rebuild your game project as usual. You will now be able to build your project with plugin source code accessible for updates and modifications.

Enable the plugin​

If you already enabled LLMAI in the Blueprint steps above, you can skip this section.

  1. Open your .uproject with the Unreal Editor
  2. Navigate to Edit → Plugins
  3. Search for "LLMAI"
  4. Click Enable
  5. Restart the Unreal Editor

Now the plugin's project settings will be available, along with the component, Blueprint templates, and events you can use.

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Note : The plugin will compile automatically from source code when enabled. This works with both Blueprint and C++ projects.

Troubleshooting​

Plugin Not Appearing in Plugin List​

  • Ensure the plugin is in the correct Plugins/LLMAI/ directory
  • Check that LLMAI.uplugin file exists in the plugin root
  • Restart Unreal Engine editor completely
  • Verify you're using Unreal Engine 5.6+ on Windows 64-bit

Compilation Errors​

  • Ensure Visual Studio 2022 is installed (required for plugin compilation)
  • Verify Windows SDK is installed and up to date
  • Check Output Log during plugin enable for specific error details
  • Try closing all other applications during compilation to free up memory
  • For persistent issues : Delete Binaries/ and Intermediate/ folders from plugin, then re-enable

Plugin Compilation Taking Too Long​

  • Normal time : 1-3 minutes for first compilation
  • If stuck : Check Output Log for progress details
  • If frozen : Close editor, delete plugin's Binaries/ and Intermediate/ folders, restart editor

API Connection Issues​

For OpenAI:

  • Verify your OpenAI API Key is correct and active
  • Check internet connection and firewall settings
  • Review Output Log for specific error messages
  • Try debug command: llmai.debug.OpenAILevel 2 in console for detailed logs

For Grok (xAI):

  • Verify your Grok API Key is correct and active
  • Check internet connection and firewall settings
  • Ensure you specified a Voice parameter when connecting (required for Grok)
  • Review Output Log for specific error messages
  • For "Rate limit exceeded" errors, check your usage at console.x.ai

For LocalAI:

  • Verify LocalAI server is running
  • Check the endpoint URL in Project Settings matches your LocalAI server
  • Review Output Log for connection errors
  • See LocalAI Realtime Endpoint for setup

Complete Documentation​

For comprehensive guides, demos, and examples beyond basic plugin installation: