I purchased SC4 discs 20 years ago, and they've lasted me through several computers, including an iMAC(with Boot Camp). For Christmas, my wife bought me one of the latest models of an HP All-In-One with a 27-inch screen, 32GB RAM, and dual hard drives. My mouth was watering to play SC4. But I had trouble loading the game with the discs, so I purchased the software through steam.com. It loaded fine and I can play it, but I don't know how to get my literally hundreds of custom content plugins into the game; I can only play with the basic game. Can you folks please help me to get this done? Also, I have the 3-disc set you folks sent me a few years ago. Will I have trouble using those? Thank You all in advance.