Tsokes

Hey everyone! I'm really hoping someone can help me out. I just downloaded The Witcher 3: Wild Hunt GOTY Edition on GOG. I want to mod the hell out of this game and have some fun with it on my second play through, but Nexus isn't detecting the game! I've tried repeatedly to do it both automatically and manually, selecting the game file or even the bin x64 file that contains the actual .exe file, but it never works. Nexus always says "No Games Were Detected! Nexus Mod Manager Will Close." Every. Single. Time. I've lost count how many times I've tried. I went into GOG Galaxy and verified the game, too, but it didn't change anything. How can I get Nexus to recognize my game? PLEASE help!