1) you don't UNZIP plugin packages. They are a Package. Leave them zipped.
2) On the Sigil Menu
Plugins: Manage Plugins (gets you a PI Management tool ): Add Plugin: You guessed it, point it at the Zip file.
Note: Some older PI may need you to install Python 2.7 (current Sigil includes Python 3.4, so that is now grey)
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