Adobe Reader 21.001.20140 (released 2/22/21)

21.001.20140 Optional update, Feb 22, 2021 — Release Notes for Acrobat DC Products (adobe.com)

This (optional) hotfix patch is applicable for  Reader DC Continuous track, fixing an error message that was incorrectly displayed and associated with a valid digital signature.

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Available via the internal updater:   Help / Check for Updates

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Remark:   This update applies to Reader, but (apparently) NOT to Acrobat.