This version is for older IOS devices that cannot update to IOS 13.x. The device must support IOS 12.x. Apple states some bug fixes and an important security update. I couldn’t find any details. If your device supports IOS 13.x this version will not be available.
I have not noticed any difference between IOS 12.4.1 and 12.4.2.
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IOS 12.4.2
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