Just got this from Digitrax:

Your upgrade has been received by Digitrax Repair Department. We will advise
you when the upgrade has been completed and is shipping back to you.

Please allow 30 working days  before making any inquiry as to it’s status.

Thank you for your patience.

Digitrax makes every attempt to return you repair to you as soon as
possible.

So now we wait and see how long it takes.

Shaun DCC