The only Ragnarok Online I know of is that one in development by a Korean company, and I don't think there's any relation to the ROGUElike, though I have been out of the loop for a while in concern with ROGUElikes. Personally when I first heard that there would be a Ragnarok Online, the first thing that came to mind was the fucking ROGUElike, not some fruity anime-styled MMORPG.
As for the latest version, well, the author of the game has a page with 2.5, so I'm guessing any later versions aren't going to be easy to locate as they're probably niche personal projects.
After a bit of searching, the only thing I've really found for the actual ROGUElike Ragnarok is a European release called Valhalla that comes with sound effects and music, though I haven't tried it myself.
Here's a link where you can supposedly get
Valhalla.
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