If you're wondering why anyone would want to do this, some people might want to do a 'challenge run' without lightsabers or Force powers.

If you change your mind later or you misclick, you'll have to reload or use a save editor. Note that there is no second opportunity to cross-class or become a Jedi. To avoid cross-classing as a non-Jedi, simply choose 'No' when asked if you want to cross-class. The option to cross-class as a non-Jedi is given through subtitles at the end of that second conversation with the Council. So, for example, a Scout can cross-class as a Soldier, etc. Scripts are included to enable cross-classing as a non-Jedi.

If you choose not to be a Jedi, that conversation leads directly into the 'corruption in the grove' quest, skipping over several parts of the Jedi training quest. As you can see from the screenshot, the new replies start with '', so there should be no confusion as to what they do or which ones they are. It adds two new replies towards the end of the second conversation with the Jedi Council. A tiny mod for KotOR 1 that gives the player the option to avoid becoming a Jedi and remain a Soldier, Scout, or Scoundrel for the entire game.

The old republic jedi knight