Go to Posersoftware.com and under support file a help ticket. I don't believe the newest version (11.2) supports offline activation in the way that 11.1 and earlier did. In the help ticket explain what you want to do and they should be able to set you up with an extended activation period.

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