Hi all - so, I just purchased Gods & Nightmares, made sure the base game was up-to-date, and when I went to play, I didn't see it listed in "Extras" like the other content updates. Am I missing something? Thank you!

Gods & Nightmares is just a soundtrack, not part of the game.

What wyrenn said. Gods& Nightmares is a soundtrack. All the current DLC that includes game content was patched into the game for free. Your game should be completely up to date.

When you dl the content with "GOG Galaxy", it appears in a "!Downloads" folder, which I guess is created by GOG (it's also where GOG seems to keep the games's update files) :)

The name of the file containing the soundtrack ("Gods & Nightmares" isn't a in-game content, it's only an OST) is "hollow_knight_gods_nightmares_flac.zip", if you've downloaded the flac version (best quality, lossless, although there probably won't be any audible difference with the mp3 version, which is encoded at 320Kbps), or "hollow_knight_gods_nightmares_mp3.zip" if you've downloaded the mp3 version. ;)