Sorry, that's an error on my part. We have Windchill 10.2 along with Pro/Intralink 10.2 Single-Site.
It's my understanding that CAD worker and the Windchill server point to a common file system that they can both reach, as per the worker configuration server side, and this is the mechanism that the Windchill server uses to transfer files back and forth. Why would it need an Intralink license if the server moves the files to and from a local directory on the worker?
Worker tests complete successfully:
If you notice, about a half hour before my test, the Vis server (PTCVIS) rapidly checks the Intralink license and and out multiple times.