Download button for levels

I am making a game for multiple platforms and I have a huge problem. The game size. I want to make a massive open world but I am sure that the package will have a ton of gigabytes. I thought and thought… And now I want to make a button in game where you can download just that what you need. For example I download just the Battle Royale part, not the open world.
Hopefully anybody help!

You need to bundle the extra assets in separate pak files and download them and use them at runtime.

So, you’ll need to know about UnrealPak.exe and making plugins, because DLC ( downloadable content ) is basically a plugin:

Thanks, I will watch and hope that I get running this quickly!