The zip contains both the ROE and the non ROE version of the PD3 patches. So head on over to the file section and get patched. Be sure to read the description for installation directions.
Now for the awesome news. I have just found somebody to continue work on adding the Spider Mastermind to PD3. nullscape is now on board to finish off the amazing work that The Happy Friar had currently been working on. So the inclusion of the Spider Mastermind is being continued as planned.
From nullscape's own words, "I've got experience with Radiant (preferring Doom 3's built-in over GTKRadiant, but I can adapt). I model in modo. My strengths are everything environment art. Brushwork, all entity work, level and gui scripting, static models, and all manner of textures/skins." So as you can see this guy has got the chops to make something epic. He's just what we need and he's into the ideas I've had to drop the Spider Mastermind into the game.
If all goes well this addition of the boss will be released as an addon for PD3. That way you don't have to fight the boss if you don't want it. The SM will be a tough addition to PD3 and will more then likely be the last big update.