When you are in Chapter 3 hell you can look into the crystal and gain xp as many times as you want, if you want to watch the video a lot. I just wanted to bring that to your attn.
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"Heya! Have you been to Baldur's Gate? I've been to Baldur's Gate... Oops, stepped into something. Have you stepped into something?"
When launching NwN, there is a button on the main screen labled "update".
This will automatic update to latest version of the game and game-launcher/update program.
It is always recommendable to keep ones game up-to-date to avoid many bugs that are fixed.
The latest version of the game is 1.62 if I remember right.
HOtU spoiler 
Linear Mode
