Game dev requires an internet connection to verify itself periodically. It's the first Poser release to take this route so far. Poser Pro and previous versions didn't require it.

You'll need to contact Smith Micro's customer support directly to find out if there is a way around the issue. 

If that doesn't help, you could get a wireless adapter for your pc, if you have a wireless modem/router. That would at least avoid the hassle of having to connect cables all the time. Not much of a solution tho I know.