Have you tried a reboot of your mac, and if that doesn't work it try a complete uninstall by following the guide here. You can ignore the date and time bit and after doing this do a reboot before installing it from the Sky website.
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Have you tried a reboot of your mac, and if that doesn't work it try a complete uninstall by following the guide here. You can ignore the date and time bit and after doing this do a reboot before installing it from the Sky website.