Packages are collections of files and data from Unity projects, or elements of projects, which are compressed and stored in one file, similar to Zip files. Like Zip files, a package maintains its original directory structure when it is unpacked, as well as meta-data about assets (such as import settings and links to other assets).
To import a new custom package:
Open the project you want to import assets into.
Choose Assets > Import Package > Custom Package… to bring up up File Explorer (Windows) or Finder (Mac).
Select the package you want from Explorer or Finder, and the Import Unity Package dialog box displays, with all the items in the package pre-checked, ready to install. (See Fig 4: New install Import Unity Package dialog box.)
Select Import and Unity puts the contents of the package into the Assets folder, which you can access from your Project View.
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A regular license allows an item to be used in one project for either personal or commercial use by you or on behalf of a client. The item cannot be offered for resale either on its own or as part of a project. Distribution of source files is not permitted.
An extended license allows an item to be used in unlimited projects for either personal or commercial use. The item cannot be offered for resale "as-is". It is allowed to distribute/sublicense the source files as part of a larger project.