Well, the base version (3.2) is available as a repack of mine, basically a click through affair. Just don't change any settings while installing.

As to the 4.8 version - there is some EOP stuff involved I think. Better get in touch with the developers of that version.

And check if by chance you have any entry in Steam's custom launch option in M2TW: right click the game ion the library, choose 'properties' and then check the launch option.