src/server/game/Handlers/CharacterHandler.cpp
en ese directorio
busca una linea parecida a esta, y sustituyela entera
WorldPackets::Character::EnumCharactersResult::RaceUnlock raceUnlock; raceUnlock.RaceID = requirement.first; raceUnlock.HasExpansion = GetAccountExpansion() >= requirement.second.Expansion; raceUnlock.HasAchievement = requirement.second.AchievementId == 0
y luego compila