Scripting issue with new 3.0.0 Unity plugin

I am trying to upgrade my Unity project from the 2.6.0 Substance plugin integration to the new 3.0.0

I'm running the 2020.3.37 LTS Unity release. I deleted all previous installations before installing the new plugin, there are no errors in the project.
When I try writing a script with the following lines;

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Adobe.Substance.Runtime;
public class scifiScript: MonoBehaviour {
  public Adobe.Substance.Runtime.SubstanceRuntimeMaterial mySubstance;

  I do not get access to a valid component 'SubstanceRuntimeMaterial'

Instead I only have access to 'SubstanceRuntime' or 'SubstanceRuntimeGraph'.

 'SubstanceRuntimeMaterial' does not exist and causes an error.

I will try a clean installation to a fresh project as soon as I have time, but a very strange bug to encounter on a new release with new documentation.