Hi Pouret,
I’m new at this portal, I saw your question and what to ask you how you got DC and GC-Games to work.
I use an XBOX One with retroarch 1.8.3
i have some DC games on my USB-Dongle but no core to load them, if I go on Online-Update > load core, retroarch crashes, the other one GC...
Only thing drive me crazy is all these new horror games nowadays is its so dark, all time. I can't even play them. I understand they trying to create spooky but be creative a little, not just darkness with pop out scare scenes.