Have you thought of releasing the old versions on GOG (gog.com)? Although I have a lot of games on Steam I’ve started using GOG as the first choice if the game is available there. GOG has developed an interface, as everyone else has had to, to get to the store, download, launch, from, etc. pretty much what’s needed to get, install, and run the games. I used to use FilePlanet and the others a lot (back in the original MOH, COD, Quake II, days) but they seem pretty much defunct now.