I decided to have a look into this. I don't have Poser12 yet, and am a Mac user. It seems to me that the Poser version of Reality relies on the Python2 scripts to bridge the divide between Poser and Reality. So... if the Python scripts were updated to Python3 then it might work.

I emailed Paolo to ask his input but then figured I'd look into it a bit myself. This led me to try converting the Python2 to Python3.

The resultant files are here:

These files replace the existing .pyc files (move them somewhere as a backup) then try putting these files in their place.

As I said I don't have Poser12 so can't test myself with Poser 12, but I did test it with my Poser11 installation which unnervingly seemed to still work. So I suspect I am not understanding something fully.

If you try it and it doesn't work, apologies - just copy the original .pyc files back until we can try again.