Install Scene Fusion

Open Unity Package Manager

In the Unity menu bar, go to Window → Package Manager. Click the + button in the top-left corner and select Add package from git URL…

Add the package URL

Paste the URL below and click Add.

Create a project and start a session

After the package imports, open the Scene Fusion panel (Window → Scene Fusion). Sign in with your KinematicSoup account, or create one at console.kinematicsoup.com. The console overview page shows both products — create a Scene Fusion project there and choose your tier. Then return to the panel in Unity to start or join a session.

If you've been invited to an existing project, click the link in the invite email. It joins you to the project automatically without a separate sign-up step.