Please refer to my blog for the environmental setup:
AirSim学习（1）安装Unreal Engine和AirSim-CSDN博客
AirSim学习（2）创建UE4项目并添加AirSim插件-CSDN博客
AirSim学习（3）AirSim的PythonAPI基本操作——环境配置与VehicleClient类
AirSim学习（4）AirSim的PythonAPI基本操作——MultirotorClient类
AirSim学习（5）AirSim的C++接口、AirSim与ROS的联合仿真
The UE4 project can be reached in Releases.