WordPress suggests the following procedure for trouble shooting.
1) De-activate all plugins except Testimonial-basics. DO NOT DELETE THEM….just de-activate them.
2) Check to see if Testimonial Basics is now working properly.
3) If it is working properly, then reactivate the plugins one at a time, checking the testimonial display each time until you find the problem plugin.
4) Once you find the plugin that is causing the problem, you can look for a replacement.
5) Let me now if you found a plugin and which one it is so I may take a look at it.
I am still seeing the same jQuery error.
Testimonial Basics 4.0.8 offers a css option for the rating system so yes it would work. However jquery is still used for the slider and the excerpts.
Also many other plugins and the theme itself likely uses jQuery scripts. Better to find the problem and fix it, as your site may have other problems related to the jQuery error.