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The Goodreads covers plugin as per the docs you found does indeed currently need an isbn until the new metadata API is released.
However you might still find for the same reasons as tags above that removing the isbn to do Ctrl+D again might also give you a result with a cover, since it may pickup a different isbn while it is fetching all that other book data (covers are fetched as a step just after that). That trick won't work from the Edit Metadata screen though if you try to just fetch covers. Either manually find an isbn for a book that has a cover you like, or more simply just use a plugin like "Search the Internet" to find a cover and drag/drop it onto the book details panel direct from the webpage.
chaley/Kovid have fixed the bug in Calibre btw so as of the next release my workaround in the Goodreads metadata plugin would be unnecessary but harmless to keep as is.
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