Here are links to PDF files of the release notes for prior versions of Natural for Mainframes. They are provided for users who may be upgrading from an earlier version of Natural other than the most recent.
Natural Release Notes Version 8.2.6 - Update of April 2017
Natural Release Notes Version 8.2.6 - Update of November 2016
Natural Release Notes Version 8.2.5
Natural Release Notes Version 8.2.4
Natural Release Notes Version 8.2.3
Natural Release Notes Version 8.2.2