I'd email them or call the number on the bottom of the homepage (modified 13 months ago, not _too_bad). I share your suspicion of old websites, but I'm continually surprised at how often these old shareware apps are still actively sold.

Or you could ask on the Realmz Yahoo group... http://groups.yahoo.com/group/realmz/

There's even a thread about registration... http://groups.yahoo.com/group/realmz/message/4948

... looks like there's still an active community of players?

Welcome to the forum.