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Q: System extension cannot be used  The system extension "/System/Library/Extensions/AppleUSBEthernetHost.kext" was installed improperly and cannot be used.

I need to install update on Quicktime. I have version 7.6.6. Updates are supposed to be installed automatically. Macbook Pro 10.6.8 can't update to current version? I am told:

System extension cannot be used

 

The system extension "/System/Library/Extensions/AppleUSBEthernetHost.kext" was installed improperly and cannot be used. Please try reinstalling it, or contact the product's vendor for an update

Mac OS X (10.6.8)

Posted on Sep 13, 2014 5:39 AM

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