GOG updated "Neverwinter Nights: Enhanced Edition" today to version 1.79 and 1.79 build 8193.3 (huge changelog
available).
In doing so, they managed to corrupt all the DLCs. For each, DLC there are now two installer files (part 1 and 2), rather than one, except that part 1 is broken (404), while part 2 seems ok (an exe, not a bin). I expect all they need to do is delete the part 1's.
Here is a list of the broken part 1's, with some lovely file names:
(112) DLC: Darkness Over Daggerford: Windows installer, English (part 1 of 2), ver. 79.8193.3 [setup_neverwinter_nights_enhanced_edition_darkness_over_daggerford_jenkins-neverwinter_nights_gog_build_and_u pload_to_nightly-95_(64bit)_(34570).exe; unknown; 0];
(113) DLC: French Extras: Windows installer, English (part 1 of 2), ver. 79.8193.3 [setup_neverwinter_nights_enhanced_edition_-_french_extras_jenkins-neverwinter_nights_gog_build_and_upload_to_ nightly-95_(64bit)_(34570).exe; unknown; 0];
(114) DLC: German Extras: Windows installer, English (part 1 of 2), ver. 79.8193.3 [setup_neverwinter_nights_enhanced_edition_-_german_extras_jenkins-neverwinter_nights_gog_build_and_upload_to_ nightly-95_(64bit)_(34570).exe; unknown; 0];
(115) DLC: Heroes of Neverwinter: Windows installer, English (part 1 of 2), ver. 79.8193.3 [setup_neverwinter_nights_heroes_of_neverwinter_jenkins-neverwinter_nights_gog_build_and_upload_to_nightly-95_ (64bit)_(34570).exe; unknown; 0];
(116) DLC: Italian Extras: Windows installer, English (part 1 of 2), ver. 79.8193.3 [setup_neverwinter_nights_enhanced_edition_-_italian_extras_jenkins-neverwinter_nights_gog_build_and_upload_to _nightly-95_(64bit)_(34570).exe; unknown; 0];
(117) DLC: Infinite Dungeons: Windows installer, English (part 1 of 2), ver. 79.8193.3 [setup_neverwinter_nights_infinite_dungeons_jenkins-neverwinter_nights_gog_build_and_upload_to_nightly-95_(64b it)_(34570).exe; unknown; 0];
(118) DLC: Polish Extras: Windows installer, English (part 1 of 2), ver. 79.8193.3 [setup_neverwinter_nights_enhanced_edition_-_polish_extras_jenkins-neverwinter_nights_gog_build_and_upload_to_ nightly-95_(64bit)_(34570).exe; unknown; 0];
(119) DLC: Pirates of the Sword Coast: Windows installer, English (part 1 of 2), ver. 79.8193.3 [setup_neverwinter_nights_pirates_of_the_sword_coast_jenkins-neverwinter_nights_gog_build_and_upload_to_nightl y-95_(34570).exe; unknown; 0];
(120) DLC: Spanish Extras: Windows installer, English (part 1 of 2), ver. 79.8193.3 [setup_neverwinter_nights_enhanced_edition_-_spanish_extras_jenkins-neverwinter_nights_gog_build_and_upload_to _nightly-95_(64bit)_(34570).exe; unknown; 0];
(121) DLC: Wyvern Crown of Cormyr: Windows installer, English (part 1 of 2), ver. 79.8193.3 [setup_neverwinter_nights_wyvern_crown_of_cormyr_jenkins-neverwinter_nights_gog_build_and_upload_to_nightly-95 _(64bit)_(34570).exe; unknown; 0];
P.S. This also seems to affect "DLC: Tyrants of the Moonsea" but I don't own that DLC.
P.P.S. I'm glad to see that they are using Jenkins. A proper post-build Jenkins run may perhaps have prevented this bug.