I remember an issue with Pythons, for example "Netherworks" that stopped working after the update to 2014 up, you did not have to rewrite the whole script, you just had to insert a new line and they all worked again, all the way up to P11.1 like the sample shown ....

ver = int(ver)

insert (on a new line):

if ver >= 10: ver = 9

or

if ver >= 11: ver = 10

depending on what poser version you still wanted to use the py script, with just little efforts a little line all these pythons were and still do work like a charm. most other older scripts could also be adapted in a similar way....

but the jump to Py3 is making things really difficult for sure unless you could make the Python think it is still working under P11 but actually is running in P13, there you would just need a Hack Python script like the one that was made to run the P11.1 Py in P11.2 faking the version number. without that hack most Pythons do not work in P11.2 even that they supposed to be working. 

Such a script sure would be a top seller for Poser13  :) or a freebie making Poser attractive for creators and end users again, especially the ones who go with it since the beginning. would be worth a thought for many that are jumping onto DS to still use Poser ....