You’ll find these packages won’t work with your project in 2019.2.0b1
The package maintainers know about the issue (at least InputSystem people do). In the meantime, you can change the cached packages asmdef files to include the reference
For anyone getting missing class UI in namespace UnityEngine error when using these packages, below is the fix.
In %appdata%/local/unity/cache/packages/staging-packages.unity.com/com.unity.cinemachine@/Editor\Cinemachine.Editor.asmdef
in the “references” section add “Unity.ugui”
After that, uninstall then reinstall the cinemachine package from the package manager. Same for InputSystem.
I ran into this problem yesterday! But this solution seems to have already been implemented by the DEVs? And Unityengine.Inputsystem still wont show up in Visual Studio… Has there been any further updates regarding this?