Missing `Darkest Dungeon` GOG native linux DLC installers

I don’t really understand how installer scripts are supposed to work with native installers. I tried the “Linux GOG with DLC” installer but it doesn’t list all the DLCs, and it couldn’t locate the downloads for the ones it did list. So I tried installing the base game only using the other install script, which was fine, though now when I try the “Install DLCs” option from the library, it lists all the DLCs but only via wine runner, which presumably doesn’t work when I’ve installed the linux native version.

Could anyone please explain how the installer downloads are supposed to work? I’d like to improve the exiting script but I don’t understand what is needed to help it find those linux native DLC downloads.