Getting Started - McManning/Coherence GitHub Wiki
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Installation
Install Blender Addon
In Blender, go to Edit > Preferences > Add-ons and click Install. Select the blender-addon.zip you downloaded earlier.
After installation make sure it's selected in the Add-ons UI.
If installation is successful, you should have a new Render Engine available under Render Properties in the Properties Panel:
Install Unity Package
Unzip the unity-package.zip you downloaded.
In Unity, go to Window > Package Manager > + > Add package from disk and select the package you just unzipped.
Alternatively, you can just unzip it right into the Packages directory of your project.
After installing the package, you can access the Coherence Settings window via Window > Coherence
Enable 'Unsafe' Code
Coherence uses a number of low level features in C# for interoperability with Blender so you will need to enable unsafe code for your Unity project.
In File > Project Settings go to the Player settings and enable Allow 'unsafe' Code:
Starting Coherence
After installing into both Unity and Blender, you will need to "start" both ends to open a channel for communication.
In Unity - this is done by clicking Start in the Coherence Settings window.
In Blender - select the Coherence render engine in Render Properties and then click the Start Coherence button:
The render from Unity will only display in your viewport when you are using either the Material Preview or Render Preview mode. Click on either of these to activate the render engine:
If everything works as intended you should see the Unity scene, including your objects, synced up into the Blender viewport:
Check out the Table of Contents of this wiki for various features you can start playing around with.