Aight, you hit the nail on this one, tried opening ComPedsP but it was corrupted, deleted it to try and fresh download, still corrupted (I was downloading installer.oiv)
so I tried again but downloaded beta installer.oiv (idk why there 2 different files provided), I could open ComPedsP without issue, and the menu is now working in game
Thanks for the suggestion of opening up the file in openIV, never would have thought of it and probably would have gone back to my backup of EUP8.3
My RNUI is from Github, all my other menus work its just this. I checked that its loaded in from RPH, tried unchecking and manually loading it ingame dont work either. I downloaded this by replacing files rather than deleting the older free EUP, if thats the clue