when I used the steam version of the game this happened to me too with fresh installs this helped it work I think
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=video&cd=&cad=rja&uact=8&ved=2ahUKEwiMk97stdKCAxXPFTQIHW6xCFQQtwJ6BAgYEAI&url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D9SKMzwKE34E&usg=AOvVaw20HkUnSVrMYv8sIjis-E9-&opi=89978449
tsl this one
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=video&cd=&cad=rja&uact=8&ved=2ahUKEwik0YS4ttKCAxVIFTQIHY9KDysQuAJ6BAgNEAU&url=https%3A%2F%2Fwww.reddit.com%2Fr%2Fkotor%2Fcomments%2F37s3q9%2Fkotor_2_widescreen_fix_flawless_widescreen_method%2F&usg=AOvVaw0PvvLo-Kpn5KBqiRPFSA3a&opi=89978449