Yeah, the download categories on my site can be a little confusing, but it sounds like you figured it out - the Pro version requires R9.6 or later, so there's one in that category.  The free version requires R9.1 or later, so it can be found there.

And yeah, I noticed the scaling issue... it sounds like you were maybe already working at a somewhat small scale within C4D and then scaled it down when exporting (the built-in exporter has a scale setting as well, which you may not have adjusted).  But anyway, give my suggestions above a try - if you scale Poser figures Up by 1000 times, they are no longer tiny inside C4D - it's a comfortable working size for most models... the only potential issue is the size of your arena is really big, so you could also try a 100 instead of 1000 scale - just use the same value for Importing from Poser and Exporting back to it and everything will work fine.

Cinema4D Plugins (Home of Riptide, Riptide Pro, Undertow, Morph Mill, KyamaSlide and I/Ogre plugins) Poser products Freelance Modelling, Poser Rigging, UV-mapping work for hire.