I don't think any assurance of 5.44 working on Win7, though sometimes it does
Quote:
If you are using Windows 7 or Vista, please use calibre 3.48, which works with all Windows 7/Vista machines, from here. Simply un-install calibre and install 3.48, doing so will not affect your books/settings.
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From
https://calibre-ebook.com/download_windows