When i try to open NTT, nothing happens. Tried running as administrator, reinstalling, etc. but nothing happens.

I used to have this strange error where it said i didn't have it on steam, but i did. Well the error is gone but this one isn't.

Make sure when you installed NTT you were on the latest update, don't downgrade to update 19. Also try re-packaging the zip into your NT folder and run NTT Assemble.

Have you tried restarting Steam or reinstalling the game ("verify game cache") and the mod?