Question
Error message when installing drivers?
I have gotten this same "System extension cannot be used" error message, and I think it is connected to my inability to select double-sided printing from the print menu. How do I reinstall this file? 
I have gotten this same "System extension cannot be used" error message, and I think it is connected to my inability to select double-sided printing from the print menu. How do I reinstall this file? 
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