having packed files that could be run to place the files in the correct directories would be best, 7zip allows you to make installers, a script that would search for the correct directory would be possible since all it would need is the correct region's registry entries for that
it would not be as difficult as you make it seem RAIST, its a matter of how lazy the programmers are or are not, after all, it would not take even that much for SE to make a entry so that the update files would go into a directory in your "My Documents" directory and the game would search there and update from there, that would only take a small POL update to make that work