What hapenned to me:
When you select your game folder, the installation app adds "Combat Mission Shock Force 2" to the selected path by itself. So, in my case, when i selected the game path the first time the installation app create a folder named "Combat Mission Shock Force 2" inside my Combat Mission Shock Force 2 folder. I had to delete that folder and re-apply the patch, that time selecting only my "Battlefront" folder in the installation setup.