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The mod forum is a bit broken. Here's how to fix it so you can actually see the list.

1) Scroll to the bottom of the page.
2) Click "Thread display options"
3) Click "Set options."

The list of mods should show up now. I noticed there were 40 items or so in the forum, but only 1 actually showed up, and fiddling with settings got me this workaround.

Of course, you have to register your copy of the game on this website first, but you already have an account, so the hard part of that is done. Just go to the top of the page and click "Register game" then put in the serial code.