Update from NC13 to 14 fails with the EPUB-reader app installed

Disable it first before upgrading to NC14:

occ app:disable files_reader

But keep in mind that the EPUB/CBR/CBZ/PDF-reader is not (yet) compatible with NC14!

See also: https://github.com/Yetangitu/owncloud-apps/pull/108

I’ve just migrated to NC14 and as expected no Epub reader…
So i tried your link and especially this :

I manually installed it and this time it was activated in NC and i tested 2 epub : Success !!

Great new as this app seems to not be supported