@vrdwarak you need to download the complete tutorial first, open it in another instance of Unity, then browse to Tutorial Assets / _Created / UI / Input, select all type of inputs in there and export to package. Then import that new package to you…
I had the same situation yesterday with Start Menu tutorial and what I did is copying Input prefabs from complete tutorial package then import into my test project. Then setup Default UI Prefabs in UI / UI Systems with imported prefabs. After that, …