It use to be that you could contact support here and request an extended activation.  It would not hurt to put in a ticket and find out what they say.  Poser 13 is much better then 11.  You can download a trial version at the same link I posted earlier.  The Trial is the same as the regular version, just that it will only work for 21 days.

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13