The new maintainer needs to resolve the lingering licensing issues. See #143795: (More than) 43 Non-GPL Themes hosted on Drupal.org and my comment at #30.

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johnalbin’s picture

Title: Resolve lingering licensing issues » Re-affirm Zen Classic has no licensing issues

BTW, I honestly believe that Zen Classic doesn't have any license issues (based on the research I did in the above issue). But it would be nice to get the original author's nod of agreement.

Leaving for the next maintainer to resolve.