Alternatively, do you have a custom plugin for Houdini which maybe overriding the latest one?
…\DeadlineRepository10\custom\plugins\Houdini
If you do then Deadline will look at this instead of the latest install
If you want to continue with 10.1.14.x then you should be able to grab the custom plugin posted in the other houdini 18.5 thread, then put that in the custom location mentioned above