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As an end user, if you're installing/updating the plugin for testing, or just for one or two users, you can just drag and drop the zip file to the My Widgets panel in your Notes client.
First, copy the Document Properties Installer zip file to your desktop. Some people have had problems installing when dragging-and-dropping from a network share or a folder with non-ASCII characters. Installing from the desktop folder can help avoid such problems.
On the right-hand sidebar of your Notes client, you will see an icon for My Widgets:
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