Poser 5 PZ3 and CR2 files which do not use characters or geometries specific to Poser 5 should be able to be opened in P4, if P5 is like previous versions. There might be issues with P4 being able to read some of the P5 material settings....

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.