VR Expansion Plugin

Hello!
Can somebody clarify what is current version of https://bitbucket.org//vrexppluginexample ? It says 4.16 in readme. Im tried to make by instruction - but both for 4.16 and 4.17 it says that VR plugin and Advanced Sessions are wrong version and fails. Also tied to replace both plugins with binary versions both for 4.16 and 4.17 - then one error left “VRExpPluginExample.dll” is wrong.

Sorry if question is stupid, im playing with unreal only for one week. Made own apartement in Unity, now remaking in Unreal and want to have same mirrors as in Unity.