NWN 1.69 and CEP 2.2b are both are needed in order to log into the server.
Here are some links:
CEP 2.2c3, select one of the following:
CEP 2.2 Automatic Install exe, 1GB, Windows only
CEP 2.2 manual install 7z archive, 550MB, any OS
CEP Vault page Visit here for latest CEP, as as well as an automatic updater.
NOTE: Windows automatic install will run, and seem to be done. It's not! It takes a long while for it to run, and it won't look like it is because it looks like it's closed. After running it, wait for a good long while for it to work. Eventually it will give a popup saying it's complete.
NWN 1.69:
NWN 1.69 Critical Rebuild Install exe, 325MB, Windows (or just update using the updater)
NWN 1.69 update, 509MB, Linux
NWN 1.69 update, 501MB, Macintosh
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You can open 7z files using many utilities, including the free utility found here:
Windows: http://www.7-zip.org/
Macintosh: Mac 7Z
Linux: Download from your distribution's Universe/Multiverse