Adobe Media Encoder: Grace period has expired; purchase a CC subscription
I have a user that experiences this once a month. He has an active Creative Cloud, all apps, subscription. Every month Media Encoder throws this error:

I have tried other suggestions I've found via Google: updating (if necessary) Media Encoder to latest version, signing out and back in to Adobe account but these haven't worked. The only solution that works is to uninstall and reinstall Media Encoder. This is an unacceptable disruption and means my user can't use the software we've paid for until I intervene (we have a very locked down environment and software installation by ordinary user is strictly forbidden).
The subscription has never been on a trial basis, license was purchased before the software was installed. Computer in question is Windows 7 Pro x64.
Any ideas?
