Installing the Reflect packages
The Reflect Viewer package
If you want to use the Reflect Viewer inside the Unity Editor, add the Reflect package:
Open a Unity Project from the Hub.
In the Unity Editor, make sure Show preview packages is enabled under the Advanced drop-down menu on the Package Manager window.
If Unity asks you to confirm your selection, click Yes.
Locate Unity Reflect in the list of available packages and click Install.
AR and VR packages
For AR and VR functionality, download the external packages from GitHub: