Why do I have to use this Blizzard Downloader? Why can't I just download the file normally?
Blizzard Entertainment is currently testing a Blizzard Downloader that is based upon BitTorrent, an open source technology which is freely distributable pursuant to the MIT License. Click here for more information. This test will help determine how we will proceed with future file distribution methods. Note that this utility is only active when you are downloading files, and that only files associated with the file that you are downloading are uploaded. Blizzard will not upload any other files, or obtain any personal information about you as a result of this activity.

What is BitTorrent and how does it work?
This technology allows users to download large files without being limited by a host's bandwidth by using a peer-to-peer protocol.

Each person downloading the file will offer a portion of their upload bandwidth to allow other users to download the same file. By using the upload bandwidth only, the individual user will not see a decrease in their download speed - in fact, the more users there are downloading the file, the faster everyone's individual download speed will be.

Why would I want to use BitTorrent?
If you have ever downloaded a file from the internet, you know it can be time consuming and is often limited by the host's available bandwidth. By using BitTorrent, the user is not limited by any one host's capabilities - instead, the files are distributed across a wide range of users, allowing for a quicker download for everyone. By using the upload capabilities of each downloader, the overall file distribution is much more efficient for everyone.

How do I set my download speed? What does this setting mean?
You can set your download speed in the Blizzard Downloader's interface (Modem, Cable/DSL slow, Cable/DSL fast, T1 or better). Please choose the appropriate selection for your connection type. Keep in mind that this selection will affect both your download and upload speeds.

I'm constantly displaying a "connecting to peers" message.
If you are using a firewall, you will need to ensure ports 6881-6999 are open in order for BitTorrent to connect correctly. If you are using a router, you may also need to set up port forwarding for these specific ports as well. You may need to refer to your firewall/router's documentation for instructions on opening ports and setting up port forwarding.

For more information regarding networks, please check our network help page at http://www.blizzard.com/support/?id=msi0423p.

I'm getting a slow download speed, what can I do to improve it?
One of the main causes of slow download speeds is an incorrect system configuration. If you are using a firewall or router, please be sure to open or forward ports 6881-6999. Also, try changing your connection speed to something slower (T1 to cable/dsl fast, etc). Since connection speed determines both your upload and download bandwidth, it is possible that your upload rate is choking your download rate.

I go to college and my network administrator blocked the ports you mentioned. What can I do?
Most college or university networks will block the ports required for BitTorrent. Unfortunately, this limitation is set by the network administrator. We are investigating other file distribution options for users who are in this situation.

Why doesn’t Blizzard supply the torrent file so that people can use other clients to download?
In order to properly test our distribution servers, we currently require people to use our client to download the file. We will consider allowing people to use other clients in the future.