Does it support Ps4 controller or do I need a 3rd party app? GOG, in general doesn't but apparently some games do, Iv'e read Witcher 3 does. Thanks in advance

You will most likely need something like DS4Windows or it won't work. I didn't try it in-game, but at least the launcher doesn't pick up the PS4 controller dpad without DS4Windows.

Thanks. It doesn't work in-game. I also tried the launcher through Steam, kept on black screening when I tried to play. Ended up digging out my X360 pad.

you can just add the game on steam, run throuhgt steam and use any controller (PS or xbox)