You weren't very clear about your problem. Was this error during download or right after it finished? If you got it after download is finished then its possible you're having windows/antivirus firewall to be blocking the update. Always, before updating the windows (assuming vista or 7) will pop a security window that will ask for confirmation before doing it. If you take too long to confirm the patcher will give a timeout error.

Anyway, try out the support page: http://support.na.square-enix.com/co...hp?id=902&la=1

There, goto "Get Support" > "Contact category: Technical Support" > "Contact sub-category: Update/Patch" > "Contact Details: 20524"

It will offer you an automated support. If it doesn't help, click at "Return to Knowledge Base Search" button at the bottom of screen and then next for SE online chat support option.