Just make sure that you keep the installer for your working version around until after you are satisfied that calibre is happy after installing the latest and greatest so you can back out of an update that breaks your system. My advice is if it is working for you, don't worry about it. The fun in this is that as calibre incorporates newer releases of QT, there is a chance that your video card will be on the blacklist. The most common symptom is that when you open a book in either the viewer or editor, you see blank pages. The issue that has come up is that QT has issues with some video cards/drivers. Is there something I am missing by not going back to 3.48? As long as the newest Calibre works seamlessly with Windows 7 SP 1, why should I revert to an antique version? I ignore this & continue to download Calibre new releases & updated third-party anti-DRM plug-ins. Visual crowding is sometimes associated with dyslexia. Whenever I get a message to update Calibre (I use 64-bit version 4.11.1), it warns me not to upgrade, but to back off to an old version of Calibre - 3.48. Download DirectX End-User Runtime Web Installer These are variants of the Microsoft fonts, Calibri and Sitka Small, which are intended to help readers with visual crowding. I use Windows 7 SP 1 & refuse to upgrade to that abomination, Windows 10.
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