DSON was written by DAZ in Python 2.7.  Currently Poser 12 & 13 use Python 3.7.  the two Python versions are different enough that 2.7 won't work in 3.7 without a lot of changes.  I believe the DSON script (or parts that it calls) are complied and DAZ is the one that has those source code files so it would be up to them to provide a new version to work with Poser 12 and 13.

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13