Edit the improvement file and change this: IMPROVEMENT OrbitalHospital to this: IMPROVEMENT OrbitalBiosphere, otherwise it'll get mixed up. That one didn't get checked too closely before it was uploaded, I'm afraid.
Alternately, you can copy and paste this version of the whole thing:
//------------------------------------------------------------------------
IMPROVEMENT OrbitalBiosphere
//------------------------------------------------------------------------
Name "Orbital Biosphere"
Model "AgentaCenter"
Description "Come visit our Orbital Paradise!"
Manufacturing_Bonus 5 //Manufacturing Bonus
Morale_Bonus 10 //Morale Bonus
Economic_Bonus 5 //Economic Bonus
Prestige_Bonus 5 //Prestige bonus
Planetary_Defense_Bonus 0 //Planetary Defense Bonus
Starship_Quality_Bonus 0 //Starship quality bonus
Research_Improvement_Bonus 0 //Research Improvement bonus
Type "Normal"
Tech_Requirement ""
Tech_Requirement_ID 212 //ArtificialSatellites
Cost 3500 //Cost
Maintenance 4
ENDIMPROVEMENT
It has been tested and works fine in my games.
End transmission.
~SDC~