On the machine with books
Open Calibre.
Go Library and Export
Create a new local directory /folder. Do not pick a Network share. A USB device may or may not work.
After it's completed that new location will ONLY have files like part0001.calibre-data etc, the number depends on how big the library is.
Copy that new folder/directory to Mac local folder, either on network or USB device.
Open Calibre on mac (install same revision)
Go Library and Import
You choose the destination (open File manager and delete anything in it) and the source folder with the part0001.calibre-data, and if library is needing more part0002.calibre-data etc.
Then all the ebooks, plugins and settings are imported.
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