Quote:
Originally Posted by John Hopper
You'll probably find that any books you put into Calibre 5.1 will need to be deleted and reinserted into 4.23 before De-DRM will work. Hope this works for you.
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That’s what I did, in fact I uninstalled the books added on 5.3 as soon as I knew there was an issue with them. Then when I reverted back to 4.23 I readded them and they converted fine.