From the SE4 Tracker thread:
How do I download a file from the tracker?
You must install a Bit Torrent client, such as
Azureus. Note that you might need to forward a port in your firewall to allow a Bit Torrent client to make connections.
Read here for more information on port forwarding. Once it is installed and configured, you can start the download of a file by downloading the .torrent file hosted on the tracker and opening it in your Bit Torrent client. Please leave the file running after the download completes, so that it may be distributed to other Users as quickly as possible.
Alternatively, you can download the file directly with this link:
Sound Pack 1.0