Thread: Epub 3 to Epub 2 downgrade.
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Old 04-21-2023, 07:42 AM   #4
KevinH
Sigil Developer
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There is no json-like structure in the OPF in epub3.

Epub 2.01 is epub2.

The reason Sigil will not open the file is because it is a folder on your mac with a name ending with .epub not an actual zip archive. Try right clicking on it to Show Contents.
MacOS Books.app is known to convert epubs from zip files to folders silently.
You should be able to use Sigil's FolderIn plugin to read from that folder.
Last edited by KevinH; 04-21-2023 at 08:45 AM.
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