1.) Open Unity3D 2020.3.7f1 or Higher
2.) Import 2CarsChallenge_v1_0.unitypackage in Unity3D.
3.) Switch the project to Android Platform or iOS Platform. Go to File -> Build Settings -> Select “Android” or “iOS” -> Click on Switch platform.
4.) Game has been developed in PORTRAIT MODE. Go to File-> Build Settings -> Player Settings -> Resolution and Presentation -> Set Default Orientation as “Portrait”.
5.) Go to File -> Build Settings -> Drag and drop all scenes located in Scenes folder into Build Settings window(build in scene).