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Old Yesterday, 12:28 AM   #1
Haiven
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Unhappy Calibre won't open, nor will any epub e-books that use the viewer

I use the Calibre e-book viewer every day to read books on my PC (Windows 11). Today none of my epub e-books will open, nor will my Calibre app. I downloaded the newest version of Calibre (7.18) and installed it, but still neither the Calibre app nor the viewer will open.

There are no error messages.

Last edited by Haiven; Yesterday at 12:30 AM.
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Old Yesterday, 02:22 AM   #2
kovidgoyal
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https://manual.calibre-ebook.com/faq...ing-on-windows
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Old Yesterday, 11:29 AM   #3
Haiven
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Kovid, I had been using the manual but had only used the solutions for when there was no error message. With your suggestion I uninstalled/reinstalled and it worked (with some confusion because I had duplicate files in my OneDrive folder).

As a side note I'm really impressed by this marvelous product you have produced!
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