I just downloaded and installed the quiz. It took a bit of getting used to but I got it going after reading the FAQ.

So I created my quiz, and started testing it out, but when I start it, it says I must be logged in to take it.

Is there a way to let non-registered visitors to the site take the quiz?

Under Quiz List, I select the quiz in question, and have set the Access(User Group) to Guest. . .

Am I missing something?

Setting Access(User Group) to Guest for quiz should work fine. This works on our demo for anonymous user.

Could you please provide us with access to your Joomla! back-end so we could login and have a look. Please send the credentials via email.

Regards,
ARI Soft

More that this we can access the quiz using guest by this link: http://www.karenmccullough.com/component/option,com_ariquiz/Itemid,62/

It looks like you have set up inappropriate access rights for quiz menu link since login message is displayed not by ARI Quiz component itself but by Joomla!

Regards,
ARI Soft