I think there is a plugin that tries to do that. However not all epub3 features are supported by epub2 unlike going from epub2 to epub3.
Since all new epub readers support epub3, and Kindle can accept epub3 for input why is going backwards important, as it will not help for archival purposes? And any "normal" fiction epub3 can add in an NCX and guide info to make them compatible with older epub2 only readers.
To future proof things, converting from epub2 to epub3 but making sure they have an ncx and guide for backwards compatibility would seem to be a better approach.
What am I missing?
Quote:
Originally Posted by Turtle91
I noticed the "RemoveNCXGuideFromEpub3" function and was wondering if it is also possible to change an ePub3 to an ePub2.
Currently I manually open the opf from the zip file and change the version=3 to version=2 then save and reopen. Not a difficult thing to do, just time consuming.
I'm thinking this functionality would require closing the epub but leave the sigil shell open to run the script, then reopening the epub...
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