Please be aware that support for version 8 of Sophos Anti-Virus for Mac OS X is ending in April 2014. April will be here sooner that you think so act now to check you have upgraded to version 9. It's a free upgrade and the installer can be run over the top of the version 8 home edition installation.
Check the version of Sophos Anti-Virus you're running. From the menu bar icon select 'About Sophos Anti-Virus'. Make sure it says 9.0.x...
If you see 8.0.xC you can download version 9 here are upgrade.
Important: Version 9 can only be installed on Mac OS X 10.6 (Snow Leopard) and higher. 10.5 and lower is no longer supported due to changes required for the newer Apple app installer. Furthermore as 10.5 is very old Apple no longer provide security updates for it so we cannot recomment you use it.
Additional information to answer more questions (18th March 2014):
At the beginning of May 2014 after v8 has retired we will migrate all endpoints running v8 to v9 if the Mac has OS X 10.6 or higher. Any Mac running OS X 10.4 or 10.5 will remain on version 8 without updates as these OS X versions are not supported by Sophos or by v9 version of the product.
Note: any endpoints running SAV v8 on OS X 10.4 and 10.5 will show failed updates after v8 retirement, it will also state in the updating logs that the version is no longer supported.
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