For very low-end XP machines, FlightGear 0.9.10 is the classic 32-bit build known for its small footprint (approx. 138 MB).
Some users have reported success with versions up to 2016.4.1 , provided the hardware has adequate OpenGL 2.1 support and enough RAM. Where to Download Legacy Versions download flightgear for windows xp
Provides a curated list of Older FlightGear Versions where you can specifically select v3.0 or earlier. Windows XP System Requirements For very low-end XP machines, FlightGear 0