Gloomhaven Incomplete Install

I am running MacOS Ventura 13.5. On Heroic version 2.8 I was able to install Gloomhaven the base game from GOG, and this installed and ran fine. Recently I got the two available DLCs on GOG. I wasn't able to figure out how to install the DLC after installing the base game, so I uninstalled the base game, then attempted to reinstall after ticking "install all DLC". This install does not complete properly however - the install just finishes / gives up at ~80% complete. At this point the game is in my library and has the option to play, but launching the game only launches a black window, and the game never starts.

I tried uninstalling the heroic launcher and removing all heroic config, then reinstalling the launcher version 2.9.1, and had the same issue.

Any help with what is happening here would be awesome!
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