Ok Thanks Finally found it.
Do you know of a video showing how to set this up. I now seem to be going around in circles.
I have used the Installer obs-websocket-4.8.0-Windows-Installer.exe
and have the 4 files in the Stages/obs folder
I have setup a scene that is a browser on obs and this shows the lower thirds words like expected.
And I have added a custom slide named scenechange:alter
But obs never changes the scene to the alter Scene