I am Dale Hayter, a Microsoft and VMware certified Technical Consultant.

My blog has been built up over the years from my experience of working on an IT helpdesk and also from being out on-site.

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Sophos Update Manager Fails to update – Software Delivery Failed

If you receive the error message shown below in your Sophos Update Manager console

Sophos1

Then check out the Sophos Update Manager log files with the Sophos LogViewer program.

This can be found in the following file paths

Enterprise Console 4.x: 

C:\Program Files\Sophos\Enterprise Console\SUM\

Enterprise Console 5.x (upgraded from version 4): 

C:\Program Files\Sophos\Enterprise Console\SUM\

In my instance I could see the error :

Decode operation failed when decoding product release 'Windows Endpoint Security and Control'. Details: Checksum error: ff35f5696fff05ec0fe4b68dd1ff6eb4x000 -> Persistance.dll

I believe the filename at the end might vary.

If this happens go to the location

C:\users\all users\Sophos\Update Manager\Update Manager

Rename the CID’s folder and the warehouse folder and restart the Sophos Update Manager service. Now try an update again. Should be okay now.