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Intal error

Installation help please. When I try to install the software (Sophos Home) on my macbook pro 10.6 it gives message "System Extension cannot be Found" The system extension"/System/Library/Extensions/AppleUSBthernetHost.kext" was installed improperly and cannot be used. Please try reinstalling it, or contact the product's vendor for an update.
No clue what to do, I have uninstalled and re installed with the same message . Also re downloaded the software, no joy. So any help would be great.Thank you.



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