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When you install a new plugin, you need to update menu.php, i.e. you need to go to the Downloads section at meteotemplate.com, in the left menu select Menu and download the updated menu.php. Then replace the original menu.php of your template with the new file.
When I release a new version of the template, the menu.php includes links to all the available plugins. However, when I release a new plugin after template release, obviously this plugin is not included in the original menu, so you need to get the updated file.
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