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I have, after countless attempts, installed NWN2 and updated to the newest patches. I however have the Gold Edition that comes pre bundled with Mask of the Betrayer expansion. How would I go about installing the expansion. I tried to just run it as a new install, but it destroys the NWN2 install and will no longer allow boots. Any advice or input?

I however have the Gold Edition that comes pre bundled with Mask of the Betrayer expansion

Does it install automatically with NWN2 or you have to run another executable?
Please list all executables you've got in "~/.PlayOnLinux/wineprefix/NWN2/drive_c/Program Files/Atari/Neverwinter Nights 2" (there should be at least one nwn2main.exe)