MOH Breakthrough help

[stanwing]

Hi all
Just trying to install acopy of MOH breakthrough and have dug out the MOH allied assault so i can install it.
Prob I'm having is when it chooses to patch my Allied Assault it says
"couldnt detect UK or US version of MOH " and quits.
I remember this fault many moons ago but cant remember hnow i solved it.
Could someone please refresh my memory.
Cheers
Stanna