I thought that it also included updated DXGI components.

No, the Agility SDK only includes updated D3D12 core and debug layer components.

https://microsoft.github.io/DirectX-Specs/d3d/D3D12Redistrib...

I see, thanks.

For my DirectX hobby coding, what is in the box even if a bit oldie is good enough, so I got my info about the Agility SDK wrong.