This is what your friend, who runs a server should do:
MBII Launcher => Settings => check "Enable logging" => Repair installation.
Post latest log from "Jedi Academy\GameData\MBII_Launcher\logs" here.
Delete files "cgamex86.dll", "jampgamex86.dll", "uix86.dll" from these folders:
- "Jedi Academy\GameData"
- "Jedi Academy\GameData\base"
- "Jedi Academy\GameData\MBII"