I am not sure how to edit posts.. sooo... excuses..
Anyway I messed around with it some more. And ran into some issues with it in OBS itself.
Everything works fine in io-cct.exe.
I had OBS 24.X installed, when I dropped the plug in in there OS stopped launching. Was kinda expectin this so no problems on that.
Downloaded latest version, installed plugins.
The InputOverlay works only partially, specifially only the DPad.
Even that does not work correctly. The DPad directions trigger other buttons.
I have uploaded a video, using OBS2 24.X and version 4.8 of Input Mapper, Recording OBS 26.x and v5 of Input Mapper.
(you can see the 4.8 version of the input overlay on the lower left of the screen.)