Thread: Downgraded from 4.23 to 3.48-can't delete books
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Old 01-12-2021, 03:40 PM   #2
jhowell
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Join Date: Nov 2011
Location: Charlottesville, VA
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If you opened a calibre library in a version 5 release of calibre then it was upgraded in a way that makes it no longer compatible with any calibre version prior to 4.23.
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