Yep. I prefer to double check even with manual config, but this time I just couldn't figure out what's the problem. I've modded Skyrim to oblivion, so I'm not new to modding. I found one topic about similar problem. Someone installed Witcher with GOG Galaxy (as I did first) and NMM didn't find the game. There was no solution, so I uninstalled both (GOG Galaxy and the game) downloaded the game files and started from the scratch. Still not working.