I can't tell you anything about the details of .pmd, but I can confirm that they don't work with Poser 5.

The .crz is a compressed .cr2.  You can deactivate file compression in Poser's preferences, and there should be at least one compression/decompression script that shipped with Poser.  Poser has a compressed form for most of its file types, since P5.  

.crz = .cr2
.pzz = .pz3
.p2z = .pz2
.obz = .obj

etc.

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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.