importing unity 2Dgame kit shows some errors - unity3d

I'm using unity 2018.3.0f2
I was studying unity 2D Game Kit Walkthrough
it needs 2D Game Kit.
I downloaded it through unity app and then started it. After a long time and many loading and processing finally unity project opened. but show me some errors:
An error occurred while resolving packages:
Project has invalid dependencies:
com.unity.package-manager-ui: Package [com.unity.package-manager-ui#2.1.2] cannot be found
Package com.unity.textmeshpro#2.0.0 has invalid dependencies:
com.unity.ugui: Package [com.unity.ugui#1.0.0] cannot be found
Assembly has reference to non-existent assembly 'Unity.ugui' (Packages/com.unity.textmeshpro/Scripts/Editor/Unity.TextMeshPro.Editor.asmdef)
I searched but didn't find any useful thing about solving problem.
can someone help me?

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