the links for downloadin nulldc which are in the post you said are expired (404 Not Found)the plugins come with the emulator download. There are tuns of torrents where you can get them but they all contain bios files and a bios is illegal.
Just grab it from here
If you read the post, it talks about plugins in the download.
I downloaded nulldc v1.0.4 and now I have new problem!so find another? Just google for nulldc 1.0.3, here is another link I found