Thread: Update Calibre v1.46 to v3.28. Any compatibility issues?
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Old 07-29-2018, 10:56 PM   #4
jhowell
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If you use optional plugins you will probably need to update those also since older plugins using QT4 are not be compatible with newer calibre. A few older plugins were never updated and will no longer run.

Also Windows XP and and some older Mac OS versions are not supported with newer versions of calibre.
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