Basically there are a couple different divisions of the main company, Groupee. There is the Eve development, which is the hosted application. Groupee, which is the social networking site, and then UBB.threads, which is the downloadable product you're using here.
There used to be a UBB.classic as well, the file based one that you're thinking of, but that was discontinued in June of last year. So, everything is pretty much still the same beyond that, just growing.
Hopefully that clears things up a bit. If not, just ask.
