The product apparently works correctly if installed at its proper location mentioned in the readme file. So the product is not "bad" because of that.

I would prefer creators would put PMD files in geometries, but others prefer them in the location where the CR2 lives. So the creator made a decision to put it in the cr2 folder (which is the default where Poser puts it if you create your own PMD files)

People who reorganize their runtimes are (or should be) aware of the path reference issues and be prepared to correct them or have the search option set the Deep.

I usually fix the issue by installing it to the default location and then move the CR2 files to my desired location. The advantage is that you do not need to edit the cr2's and the disadvantage is a cluttered root in the runtime:libraires:character folder.