I have no problems with my network and have successfully run the Xbox Live connection test. Everything checks out, no NAT issues, etc. Every time I launch AC III it tells me an update is available. When I click "Download Now," it hesitates for a fraction of a second, then says Unable to Download, with error code 3F45-0000-D080-0200-8007-2751. Anyone else seeing this?
I'll post in support too. Thanks!