How to Import an Unity package or Asset into Unity3D

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Click on Assets->Import Package->Custom Package...
Select the unity package that you have downloaded or your previous project backup which has a ".unitypackage" extension
A pop-up window will be shown which has complete file list that are there in your package. You can select/deselect the files you want to import
After selecting all the necessary files, click on import

Wait until the package is loaded completely
You can see all the assets loaded in the "Assets" Tab. Just drag the scene to "Hierarchy" tab that you want to edit or double click the scene.
That's it. You have successfully imported the asset in Unity3D