: In-game, one player should "Host" a LAN game while the others "Join" via the LAN tab to connect.
: Use x360ce (Xbox 360 Controller Emulator) to map DirectInput controllers to XInput. Place x360ce.exe in GameData , configure, then run split-screen launcher.
The Star Wars: Battlefront 2 community has created various mods over the years. Although I couldn't find a specific, stable, and well-maintained split-screen mod for the 2005 version, I did come across some promising leads:
Install Battlefront II but do not launch it yet. Navigate to the installation folder (e.g., C:\Program Files (x86)\Steam\steamapps\common\Star Wars Battlefront II ).