Ok, I've managed to download the music and the other part, and they installed to whereever they needed to go. However, I can't read the readme, so I don't know whatever else I need to do. Help?

You need to create a second shortcut on your desktop or in your start menue that links to Homeworld 2. Right-click on the new shotrcut and in the "Target" field, at the end of what is already there type" -mod HW2SW_WARLORDS_BETA_V0.29_TEST.Big -luatrace", then click apply. The text in bold is the name of the file you extracted. That's what it is named on my computer, but yours may be differend to make sure to check that. After that, use the newly made shortcut to start the game. To test it, click "Player vs CPU". There will be a drop-down box under the "More Options" button. You click this and select the Warlords mod v0.29. As the versions on the mod are updated you only need to change the bold text above to match whatever new file you've added. Hope this helps