I just got Starcraft 2 Beta avaiable to dowload on my account(didn't receive email tough) and after I download Starcraft_2_Beta_enGB.exe and run it, I get the following error messeage: “There was a problem authenticating your download. Please go to http://www.blizzard.com/account/ to start a new download.”
Using the downloader from the other site gives me the same result.
I don't have the downloader blocked by firewall and I'm the admin of the computer. So am I really not authorized or is there another problem?

Edit:
Here is the downloader's log:
03/05/10 14:09:47.4207 Downloader initializing...
03/05/10 14:09:47.4210 Creating Firewall interface
03/05/10 14:09:47.4211 Success!
03/05/10 14:09:47.4213 Enabling Microsoft Firewall UPnP Framework
03/05/10 14:09:47.4214 Success!
03/05/10 14:09:47.4215 Enabling Blizzard Downloader on Windows Firewall
03/05/10 14:09:47.4215 Success!
03/05/10 14:09:47.4216 Creating Firewall interface
03/05/10 14:09:47.4217 Success!
03/05/10 14:09:47.4218 Creating Microsoft Firewall Rule: Blizzard Downloader: 3724
03/05/10 14:09:47.4219 Success!
03/05/10 14:09:47.4220 Not found Bonjour service.
03/05/10 14:09:47.4221 Creating UPnP interface
03/05/10 14:09:47.4222 Getting UPnPDevice Information
03/05/10 14:09:47.4223 Connecting to: http://eu.tracker.worldofwarcraft.com:3724/announce with 1
03/05/10 14:09:47.4224 Connected in 47+727 ms
03/05/10 14:09:47.4225 Connecting to: http://eu.tracker.worldofwarcraft.com:3724/announce with 3
03/05/10 14:09:47.4226 Connected in 48+726 ms
03/05/10 14:09:47.4227 Restoring UPnP value to true under Windows Firewall
03/05/10 14:09:47.4228 Success!
03/05/10 14:09:47.4229 Removing port 3724 from Windows Firewall
03/05/10 14:09:47.4230 Success!
03/05/10 14:09:47.4231 Disabling Blizzard Downloader for Windows Firewall
03/05/10 14:09:47.4232 Success!
03/05/10 14:09:48.7192 No UPnP Device Found.

Maddragon,

Try what Sixen mentioned. If that doesn't help, make sure you no proxies are active in Internet Explorer even if it's not your default browser. In IE->Tools->Internet Options->Connections->Lan Settings->make sure only Automatically Detect Settings is checked->Ok

FYI: The downloader uses your IE connection settings.