Thanks for the updates 
The Poser script error means you don’t have Service Pack 2 installed. You have to - there was no weight map support in python until service pack 2.
I haven’t tried Tyler, yet. I only tried Miki 4. It’s entirely possible that there is something wrong with Tyler that my utility can’t fix.
Well I had to give my brother back his laptop so I don’t have access to Poser 2012 now :(
I have tried the process (word for word) using Poser 9 (with SP3) with exception of the poser 2012 optional phase, but Carrara still hangs when trying to import the modified Tyler_unconverted.cr2.
Just to be clear (with your instructions) am I doing the following correctly?:
Step 1:
Copy the following to a folder on the desktop..
Tyler.cr2
Tyler.pmd
Tyler.png
Tyler.xmp
Genitals (folder) containing..
Tyler Genitals.crz
Tyler Genitals.pmd
Tyler Genitals.png
Tyler Genitals.xmp
Step 2:
Run the PreparePoserFile utility on Tyler.cr2 (in folder on desktop) Press GO, feedback box opens saying ALL DONE.
DELETE Tyler.cr2 (original file) and rename Tyler_converted.cr2 to Tyler.cr2.
Step 3:
Run Carrara 8.1.1.12 pro (64 bit), create a new scene ( i choose to delete the default light and camera so nothing remains in the scene) and then go to file/import (please see attached image) and use options in the screen shot image. PRESS OK.
At this point the mouse does its `sand dial` thing, Carrara becomes UN-responsive. I click on the screen (which then goes grey) waiting for ages does nothing and the program remains UN-responsive to the point where I have to use the Task manager to close Carrara.
Do I need to change any of the poser importer options ?
I cant go any further with regards to steps 5,6 & 7 due to Carrara crashing at step 4 :(
MIKI4:
You must edit the CR2 between steps 3 and 4 (after prep but before loading into Carrara
for the first time). The feet are parented to the BODY, when they should be parented
to the shins. You must edit both actor sections to change the parent, and the figure
section to change the hierarchy.
Do you mean edit the hierarchy in poser? as this may be where I am going wrong 
I did try this but Poser 9 tells me that the file being read is not a valid poser file !
Thanks Fenric 
Click thumbnail to see full-size image