The script works fine for me on Win10 / Poser 11.3 when the zip is on my own system. I tried to load form my store files in Rendo but that did not work because apparently the zip was not downloaded to the location the script assumes. (or was that not intended?)

I do see the advantage: you can load the content via drag and drop from Explorer, the Runtime needs not be in active in the library.
What is not clear to me though is where the script filters between refenced files that are in the .zp and therefore will be copied to the dstination folder, and referenced files the content needs but that are not in the .zip and for which the referenced address must be kept as they are.