Just a reminder when installing 3rdparty software on MacOS.
Starting with MacOS Sierra 10.12, run:
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# sudo spctl --master-disable |
Starting with MacOS Catalina 10.15, run:
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# sudo xattr -d com.apple.quarantine /Applications/<YourApplication>.app |
As a note here:
Go to Menu –> Store –> Check for Available Downloads, to refresh your iBooks login manually. Also make sure the iCloud option for iBooks is enabled in settings.
Updated July 4, 2022: On MacOS 12, Go to Settings –> Apple ID —> iCloud Drive, disable and re-enable the iBooks sync. If this does not work, logout and re-login the Apple ID.