No module named "pxr"

[R3cho]

I downloaded the zip following the instructions:
"
From Zip
For Windows a zip containing QuiltiX and all required dependencies can be downloaded from here.
"

Cannot use the "Open in Usdview..."

Traceback (most recent call last):
File "C:\Users#####\QuiltiX_win_v0.8.0\QuiltiX_win_v0.8.0/python_libs/pxr/bin/usdview", line 11, in
import pxr.Usdviewq as Usdviewq
ModuleNotFoundError: No module named 'pxr'

Could someone tell me what I'm doing wrong?

thx