I’m sorry if you had a bad day, I tried to give advice but maybe you had other stuff going on.
Again, if you didn’t like js and css of this plugin you could disable its css by settings “Presentation” to “custom”.
Turning “Enable smooth scroll effect” off would probably cancel the js too.
If that wasn’t still enough there are “pagespeed plugins” which does the inlining of the JS and CSS for you such as wp-optimize, but of course it’s better to avoid another plugin overload when possibile or you can do it one for yourself as I did.
I’m glad you found an alternative, because this plugin is not even supported anymore and I’m not using it anymore, instead I’m using the fork version “Easy Table of Contents”.