Same issue, hope it gets fixed soon

I downloaded from gog.com CoM and Musceteer installer and its working.

Confirmed :) I alredy did the same ad works perfectly but you have to download installers from website( only CoM and Musceteer) and install it manually to the game folder :)

Yeah, solid solution, I just hope that all of the possible upcoming updates will be synced with all DLCs, no matter how they were installed.

I'm not quite sure about it though, as when you chose this way in order to install the DLCs, it explains that it will not support online changes (as updates, etc.)... :(

That's why I would suggest to wait for GOG to resolve this issue; binstead of launching a new game with these DLCs with the risk that you won't be able to get the updates.

(But that"s just my humble opinion.) :)

Can always reinstall: D

Right, however I'm just to lazy to manually install all the DLC's one by one. :p

As of a couple hours ago, I bought the CoM DLC and picked up the Musketeer. Used GOG Galaxy where it first downloaded and installed the update to Darkest Dungeon, then both of the new DLCs showed up in Galaxy the way stuff normally does. Galaxy then installed both fine and they are both working for me. Hope the issues resolve or have already been fixed for everyone, the add-ons are amusing early on here.

Almost 2 days ago DLC released by RedHook. Still not working if installed with Galaxy...No words

As i wrote "by RedHook". Release date: June, 19

Yes, they released DLC on Steam and HB on that date.

But they also sent DRM-free version to GOG at the night of that day so it was not possible to release by GOG on 19 as on 19 during the day GOG did not receive any version from RedHook.

Here is RedHook's tweet from late night of 19:

https://mobile.twitter.com/DarkestDungeon/status/1009120304726204416 See? Steam/HB was ready, GOG wasn't.

Check out, there are DLC in the Galaxy

A heads up from me as well, both new DLCs now show and install on Galaxy. Happy hunting.