I've been trying to download my purchased copy for the past several hours. The problems started in the form of the sin.sdc file getting to about 15% and then restarting for no apparent reason. I followed some steps I found around here including:

-Download and archiving the file

-Using both the US-1 and US-2 servers

-Updating the XML data

-Checking/disabling my firewall

-Restarting my computer

After taking these steps the file will now not progress past 1-3%. When it
reaches this point it freezes indefinitely. I'm hoping I just missed something stupid, and if anyone has suggestions I would love to hear them.