Jonathan,
you can run QUICK versions in parallel if you put them in different
paths, like a licensed version v1.41 and an unlicensed v1.5 evaluation
copy.
If you come to the conclusion that the new release work better for
you, you'll find your upgrade here:
http://wstools.hyperphp.com/html/quick.html
The adding and removal of the attributes should work smoothly in both
version, but there have been some fixes and extensions for attributes
with the PATH syntax (which are used by ZENworks)
Wolfgang