Hi Stu,
I’m working on getting a functioning EyeX for UE4 plugin up and running, but it might take some time. The main API change for UE4.9 is solved by this pull request: https://github.com/Temaran/EyeXforUE4/tree/v/4.9. When I tested that branch with the EyeX demo scenes it seems some Blueprint code is broken, so I cannot merge that pull request as is. You might want to try using that branch in the meantime if you need to be on UE4.9.