I'm sure that just about everybody here has seen this from the READ ME FIRST file for product updates ...
After installing the product update, run WksUpdate.exe from the server's ..\Mas90\Wksetup folder at each workstation on which you would like to update the local help files.
I've worked under the assumption that this only updates help files for quite some time. After wasting about four hours, I just discovered that not only does this file update help files, it also updates the PDF driver files for Windows 7 and 64 bit machines.
Only tumbled to this because client was helping update workstations and was not all workstations were getting this run. This leads to the infamous "Unable to Initalize PDF Converter" message and a few other slightly more subtle problems.