ashorsley,
One thing you can do is set it such that if the user fails the quiz, then it jumps to a slide you have created. The slide can simply say "Thank you" or "Sorry, you did not pass" and include any further instructions the learner might need. Say whatever you want. Either way, you then set your Project end options to Close the Program. So it looks like this:
For instance:
Slide 26: last question slide in the quiz Properties: On slide exit: Go to next slide
Slide 27: Results of the quiz slide Properties: On slide exit: Go to next slide
Slide 28: "Congratulation you passed!" Properties: On slide exit: Jump to slide 30
Slide 29: "Sorry, you did not pass." Properties: On slide exit: Jump to slide 30
Slide 30: Thank you. Properties: On slide exit: No action
In Publish/Preferences/Quiz/Pass or Fail, set the following:
If passing grade: Jump to slide 28
If failing grade: Jump to slide 29
In Publish/Preferences/Project/Start and End, set the following:
Project end options: Action: Close Project
That should do it if I understood your problem correctly. It has worked for me.
WARNING: In Publish/Preferences/Quiz/Settings if you have set Required to Pass Required - the user must pass this quiz to continue, then this solution will not work. Set it to Required - the user must take this quiz to continue, then it should work fine.
Good luck. Let us know how this solution works. Any more questions, feel free to ask.
Take care,
Jorge G.