So, update.
Called x-rite UK Friday afternoon, and the (very helpful) receptionist directed me to the contact form for support, Switzerland.
Email on Monday, with instructions.
A failure was found trying to swap dongle flags. Error: failed to parse server message.
Email back a couple of minutes with manual activation - success.
Given that I've had 15 good years out of the rev D, with hundreds of profiles, that is pretty good customer support!