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Old 01-31-2020, 03:41 PM   #4
BetterRed
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Posts: 21,825
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Join Date: Mar 2012
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The most common reason calibre 4.x won't work on Windows 7 is that the version of the Qt Framework that calibre 4.x uses for its UI heavy-lifting has problems with some old video drivers.

One the major changes in version 4 was to use a later version of Qt that allowed the webengine html renderer to replace the now defunct webkit.

BR
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