I've got a TDK Bluetooth card and tried to look for the MS Bluetooth upgrade as well. From what I can tell, Microsoft just say to go contact your manufacturer for the upgrade as they don't distribute it on their website at all. I would send it to you but TDK are useless and ignored my request for it.

In this case, I guess you'll have to email Microsoft Customer Support or something and try to explain your problem. It's a bit stupid that there is absolutely nothing included in the box though. A CD with SP1 would have been useful because otherwise downloading that over a 56k modem would take ages.