Another way to create unity Loading Level Async for free ?
I have tried to make but unfortunately, requires unity pro 
Well⌠Short answer: You canât.
But you can simulate it in a way, if what you want to achieve is a âloading screenâ.
You should have a Scene whose sole purpose is to load another scene. Whenever you want to âloadâ a game or a scene, you will call the loading scene which in turn will call the scene to load, while showing some sort of gui to communicate to the player that the game is loading.
The downside is you canât animate it, but youâll have to limit yourself to a static loading screen.