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Yes, at first, because I had associated the reader with .epub before the 64 bit version arrived, and had not uninstalled that. However, as I said in my reply, the latest version also fails for me.;
calibre, version 3.14.0
ERROR: Could not open e-book: Failed to read book, D:\Calibre work\To load\travelsinnortham02lyel_1.epub click "Show Details" for more information
Traceback (most recent call last):
File "site-packages\calibre\utils\ipc\simple_worker.py", line 284, in main
File "site-packages\calibre\ebooks\oeb\iterator\book.py", line 64, in extract_book
File "site-packages\calibre\customize\conversion.py", line 245, in __call__
File "site-packages\calibre\ebooks\conversion\plugins\epub_in put.py", line 259, in convert
ValueError: D:\Calibre work\To load\travelsinnortham02lyel_1.epub is not a valid EPUB file (could not find opf)
So the problem persists.
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