Here is the info on reverting your patch status.

If you installed it and want to play here it is a simple and a 7MB download and running the updater again which will uninstall the 1.69 patch.

How To remove the 1.69 patch

1. go to the patch site.
http://nwn.bioware.com/support/patch.html

2. Find the one that matches your install and click on the 1.68 version.

3. You will be taken to a second page with a choice of languages. Choose the right language and download that file.

4. Place the revert patch file in your Neverwinter Nights install directory. The default install directory is "C: \NeverwinterNights \NWN ".

5. Run the update fro with in with NWN. When you launch the game you have the options; Play, Toolset, DM Client etc.. one of the options is update. If you have the revert file in the right place it will set you back to 1.68 and you can play in arcana again.

To go back to 1.69 just move the revert file to another directory and update again.

I hope this helps someone