When do you use the old AS license(11 ciffer) and the new one(25 ciffer)? Can an AS4.2 use the new 25-digit license?" Where is the information to find in the help?
Automation Studio V4.2.10 and later has been re-released with the new Automation Studio licensing model (like AS 4.3). Therefore the same licensing costs as V4.3 apply.
I could not find any information yet about this in available revision information.