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Assuming you've downloaded the KoboMetadata.zip file it will just load into calibre | Preferences | Advanced | Plugins | Load plugin from file with no need to manually process the zip file.
I believe DNSB is referring to the fact that Apples / Safari tend to automagically expand zip files on download, and that it's possible that you were selecting the pre-expanded file to load into calibre.
Additionally this plugin IS in the list of installable plugins presented by Calibre in the Preferences | Advanced | Plugins | Get new plugins menu.
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