How to tell if I have installed mods or CC ?

Hi, I have some strange issues with the game noone else has ;p and one other person who had similar issues said it was caused by mods. I never used any, but then I though I play this game since 2014, might be I used to have some and I dont remember that 🙃

I couldnt find an answer anywhere on the Internets 🤷

So could someone please tell me how to check if I have any mods or CC's installed in my game ? =)