I believe the order I used was:

  • Install Classic S.M.A.C.
  • Install the expansion.
  • Patch the expansion up to 2.0
  • Add in the XP fix
  • Attempted to start the game, was told my CPU wasn't supported.
  • Editted the .ini file


Since it was months, maybe even over a year since I last installed S.M.A.X. I'm not entirely sure if this is the order I went through, but if it's not the precise order it's at least quite close. (And I still have my copy installed currently.)

Bear in mind, if you install the expansion and patch it to 2.0, you do NOT need the 4.0 patch to the classic version.