Poser talks internally to its library.
it does NOT need Internet.
But it does need Flash or Adobe AIR to function properly.
And you will have to give Poser permission in your firewall.

Search for your poser.ini

In there you will find a line
LIBRARY_IS_AIR 1

1 it is running on abobe air
0 it will run on Flash

You will need one of them at least: Adobe AIR or Flash.
But they are on the CD. (do not know in the trial version)

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!