My Internet is currently down, and will be for 10 days, thanks to the incompetence of ATT. Unfortunately Steam will not let me launch the toolset or game when Steam starts in offline mode, it thinks it needs to update (ie download more ads as I have no games with updates), so Steam does not launch and generates an error.
At least I can use the flamewind conversation editor to do some writing.
Edit: I discovered that if you launch nwn2toolsetlauncher.exe you can start the toolset without Steam trying to launch. Still can't start the game (including via the toolset), so there's no way to test your toolset work, but you can at least work on things.