The JSM's Show Term Meta plugin displays all term meta keys and their unserialized values in metabox at the bottom of term editing pages..
Older plugins that supported term meta before WordPress v4.4 may not use WordPress term meta functions, preferring to use their own custom term meta solutions instead.
This custom term meta., which is not stored in WordPress term meta table, will not appear in Term Meta list.
You can contact the author of those older plugins to request update.
As example, Yoast SEO plugin still does not use the new term meta functions, while WooCommerce and WPSSO plugins do...
In Search box, enter the plugin name..
Click Install Now link for the plugin..
Navigate your local folders directories and choose ZIP file you downloaded previously..
Browse the code, check out SVN repository, or subscribe to the development log by RSS...
Version components {major}.{minor}.{bugfix} {major} = Major structural code changes re-writes or API changes. {minor} = New functionality was added or improved in backwards-compatible manner. {bugfix} = Backwards-compatible bug fixes or small improvements. {stage}.{level} = Pre-production release dev < b < rc ...
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