I'm having trouble installing the PRC. I have NWN Diamond Edition on Windows XP Professional, using Google Chrome. When I try to run the executable installer, an NSIS Error comes up with the text:

Installer integrity check has failed. Common causes include incomplete download and damaged media. Contact the installer's author to obtain a new copy.

More information at:
http://nsis.sf.net/NSIS_Error

I downloaded it twice on Chrome and once on Firefox, and got the same error message each time. I also tried the rar with Chrome, but portions of it failed to extract.