Please download XMLmind DITA Converter v2.6.2 from
http://www.xmlmind.com/ditac/download.shtml
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XMLmind DITA Converter v2.6.2 (August 18, 2016)
The EPUB 3.0 files generated by ditac are now compatible
with EPUB 2.0 readers. Several other minor enhancements.
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More information in http://www.xmlmind.com/ditac/changes.shtml
XMLmind DITA Converter v2.6.2 should be integrated into XMLmind XML
Editor v7.1 in the next few days. It will take more time to integrate
this version into XMLmind XSL Utility and XMLmind XSL Server.
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http://www.xmlmind.com/mailman/listinfo/xmleditor-support