Download the provided file and it'll overwrite a game in slot one. Change the extension to 01, 02, 03, 04, 05, 06, 07, 08 or 09 to overwrite a different slot. (Extract in different directory to do this.)
If you want to make all future games on any difficulty use the Superhuman Map, all you need to do is four or five EASY PEASY steps.
1. Open "UFODATA"
2. Make Backups of the Citymap1-5 files and .dats of the same names
3. Put them somewhere safe
4. Delete the ORIGINAL Citymap1-4 files and .dats of the same names
5. Copy Citymap5 and Citymap5.dat four times and rename the copies into Citymap#/.dat
1 is Beginner
2 is the level after that (?? Rookie? Skilled? ??)
3 is Normal
4 is Veteran
5 is Superhuman
If my savegame won't work and reverts to the old Beginner map, use the above steps and enjoy. REMEMBER, NOTHING BUT THE MAP IS CHANGED, THE DIFFICULTY SHOULD STAY THE SAME. You'll need good map coverage though, as there are lots of places for the Aliens to change their Dimension Gates to.