Inside of Unity, you can find this under Edit > Project Settings.
Note: coherence requires Unity 2021.3 LTS or later.
Within Package Manager in the Project Settings panel, add a new Scoped Registry with the following configuration:
You can access the Package Manager via the Window drop-down menu.
Select the Packages: Unity Registry dropdown and choose My Registries. Note: if you don’t see this option, double check steps 1 & 2 first!
Under coherence, you’ll see the current version and an install button. Click this to install the latest version of coherence and get started.
When the coherence SDK installation has been successful, the Welcome Window will be shown on starting Unity. Tip: Make sure you allow HTTP connections in Editor, otherwise you may encounter Insecure connection not allowed errors. Please see this article for more information.