In the posts where various users have referred to UDIM, it seems like those long, composite textures  show up a lot.  If the process is combining all of the textures into one long strip, it seems like that would make texture editing and modification a hellish sort of process.  I guess I'm wondering whether those strip-images illustrate the staggering of overlapped UV sets or an actual merged texture-on-a-strip.

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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.