I encountered this same question with a faculty member who is off campus.
I tried the steps documented here:
Creative Cloud Help | Create license file
Building the package and running the AdobeSerialization file, which prompted for a password, did the trick. I did have to quit out of the Creative Cloud application for it to change the app from showing as a trial with a # of days remaining, to indicating it was licensed normally, but any other apps they accessed were licensed correctly.
I know this is a months old question, but hopefully it helps someone out in the future.