Desktop Central to 90003 from 80294 upgrade failing

Desktop Central to 90003 from 80294 upgrade failing

Hi,

I am trying to upgrade my version of Desktop Central to 90003 from 80294. However each time, this is what it does:
 
Creates a backup
Goes through the installation process
Goes on to say uninstalling before the final message states uninstallation successful.

Looking at the logs the only 'severe' messages I can see are below, although there are a few instances of these within the logs:

Sep 19, 2014 3:48:11 PM  [com.zoho.framework.utils.crypto.EnDecrypt]  [SEVERE] : Encryption failed

Sep 19, 2014 3:47:31 PM  [com.adventnet.db.api.RelationalAPI]  [SEVERE] : haltjvm.on.dbcrash is set to [false]
I am downloading the update from the link provided:
 
Any suggestions as to what the cause/fix is?
 
Thanks
Adam
 
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