@John C
does not matter:
with “your” key you can install any version 15 (and any sub-version…) – BUT ONLY ON THE SAME MACHINE as before
(you can (re-)find your key, if logging into your account at “ashampoo”).
If you get problems, create a new email address and register with this new address to get a new key for another machine.
@Bill Arnol
you must register – than you will be sent “your” personal key for your installation.