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I use Sophos 9.0.11 on a Macbook Pro that has the lastest Mac software.
Since a couple of days, neither the auto-update nor a manual update work.
What should I do?
You can try killing the update process and trying again.
It is the Home Edition right? http://openforum.sophos.com/t5/Mac-tools-help/Initial-troubleshooting-for-updating-problems/td-p/16363