The Rokoko Live plugin can be found here: https://www.unrealengine.com/marketplace/en-US/product/rokoko-studio-live
Click the Epic Games Launcher and navigate to the Marketplace tab.
Use the search bar and type in “Rokoko Live”.
Click on the Rokoko Live asset.
Navigate down the product page and click the “Install to Engine” button.
Once finished, click the “Launch” button at the top of the Epic Games Launcher window.
Open an existing or new Unreal Project (if this is your first time, we recommend opening a new project).
Once Unreal is open, Go the Edit->Plugins->Installed and make sure "Rokoko Studio Live" is enabled.
To get started with the plugin head over to our getting started article: Getting Started: Streaming to Unreal Engine