P11/Pro11 has the same activation/deactivation feature that Game Dev has. You have two choices. Have your system on a dedicated internet connection or go through the manual activation. The documentation should have the information on manual activation. If you can't find it, either contact tech support and/or go over to the RDNA P10/Pro2014 forum and look for a lengthy thread "...yes, Poser deactivates..." or something to this effect. Near the end of the thread there is a step by step by one of the members who has gone through the deactivation/re-activation at least twice.

Basically, Poser now phones home every 60 days if it has a dedicated connection. If it does not, it must contact the activation server at least once withing 180 days or Poser deactivates. There is a way to manually activate but it does require an internet connection to obtain the activation information. Sometime in the future, SMS is supposed to create a portal that will allow you to register your copy and make the manual activation permanent to avoid the deactivation. How this works or when it will be available is anyone's guess.