One of the problems you have is the two different versions of calibre have different database structure. The database was changed with calibre 7. So 6.11 won't work with it.
You have two choices, stop using 6.11 or on the computer with an older MacOS, find a hack to allow you to install a newer MacOS so you have run the current calibre 7.
Last edited by JSWolf; 12-28-2024 at 05:28 PM.
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