Where is XR Interaction Toolkit and Input?

I do some research and know that 1) XRTK is a pre-release package so I need to open the setting and allow the pre-release package. 2)XRTK a dependency on Input System. If that package has not already been installed, Unity will automatically add it to your Project. (documentation)

So I download the Input System and check the package management setting with allow pre-release package and dependencies, but XRTK still not in the package list.

I find the link and try to add the package with the link, and it just show me input.system

And I still couldn’t use the XRTK.

Could anyone tell me what did I missed?

If you are using Unity 2020.3 or newer, you should be able to see XR Interaction Toolkit in package manager as long as you enable Edit > Project Settings > Package Manager > Enable Preview Packages. Which version are you using where you do not see it even when you enable that option?