Odd Requirements for IL2CPP

I got Unity with Visual Studio 2019 and Windows Build Support, but when I try building a project, it says either VS 2015 or Windows SDK are not found. I am new to IL2CPP, so what do I need to download to get this to work? It said nothing about this in the documentation. :face_with_spiral_eyes:

But it does look like I got the SDK automatically; this wasn’t here before I installed Unity :eyes::

Never mind. I don’t know what that folder was for, but I got the SDK normally from the Visual Studio Installer.