[keycloak-dev] Keycloak demo

Hey there, this is not really a development question (not yet), but I think somebody can help me out here. In the latest (5.0.0) documentation for server development, you have the topic 8.3. Authenticator SPI Walk Through. There you can find an example for third auth plugins, but the latest "demo distribution", which contains this example, could I found for the version 4.3.0. Is there any newer version, I didn't found or how can I go on to take a look at this example and deploy it? Thanks a lot. Micha Preußer