Thread: Calibre-parallel.exe hanging and not opening windows
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Old 10-19-2019, 06:02 PM   #3
JSWolf
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The problem is with Windows 7 not being properly supported by the QT used in the new Calibre 4.x. The reason for this is Win 7 is at it's end of life.

To make sure that Calibre will run properly, you can upgrade your Win 7 to Win 10 for free.
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