Sorry it took me a while, work has been demanding. I'm friends with one of the mods on Facebook, Mamemame187, he was kind enough to give me this link to his saves on his Google Drive as well as some instructions for using them.

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https://drive.google.com/drive/folders/1C9Co4uuo3XAYBH1ljz5hbB_4N5h1VGab?usp=sharing

The main ones are "world", "Adventure", and "creative". "world" is the original one that was the main world until end of December 2012, and then "Adventure" was the primary world from then until close. "creative" is the plots world.

All the worlds are Minecraft 1.8.x worlds, and should open with no issue in 1.8.9-1.12.2. There will likely be issues opening in 1.13+ unless you open then in 1.12.2 first so I'd recommend just using 1.8.9 or 1.12.2 to take a look to prevent any glitches or whatnot.