Folder in Client directory

We have Epicor Client installed and I am using the Inspection Plan. We had a user that couldn't use the Insepction Plan because they were getting a file path error.  The path was saying the C:\Epicor905\Client\PCLibrary.....was missing.  They didn't have the PCLibrary folder was missing but I have it installed.  Does anyone know how or why this folder gets installed?  I have some users that have it and some that don't have that folder.  Any thoughts?

Thanks Kim