New company has the rights, so GOG has this last minute thing that makes it free or lowers the price to a insane amount with a bundle.
Before they are pulled.
THE BEST METHOD to run PSX games (and everything else for that matter) is via Retroarch - http://buildbot.libretro.com/nightly/
If you have any questions on how to set it up on Windows please feel free to ask, its very easy.