Hi Crayden, thanks for your detailed feedback.
I've looked into this and it appears to be a problem creating the directory to place the FaceGen-modified texture images in:
D:\Users\Public\Documents\My DAZ 3D Library\Runtime\textures\FaceGen\MORPHNAME\
Where 'MORPHNAME' is the name you specified in Exporter.
The problem appears to be that one of the directories in this path is a file, so Exporter is unable to create that path to place the output texture images.
Can you please check how much of this path exists on your computer and let me know if there is in fact a file of the same name as one of these directories ?
Best wishes,
PS. The shape morphs should have been successfully saved.