To add to what cvanwie has said, I googled the error code and most posts says it's a network problem. Well trying to confirm if it was a vox problem and maybe not a firewall issue on my current adapter, I ran the update with a VPN (MWeb's backbone) on. Update went through and started downloading instantly. I told cvanwie about this, and he said he was going to change one thing on my account. After he did that, I retried without the VPN - the update carried on downloading from where it left off.
Thanks for your help. I'm sure I'll get this resolved first thing in the morning for everyone to benefit from.