If you view the site using a default theme such as twentyseventeen does it work then?
The JS used on that page just triggers the click event on all of the individual checkboxes, I suspect something else is changing the click events on the page, most likely the theme.
Usually it’s best to stick with the version of jQuery that’s bundled with WordPress core. If you want to serve the same version from a CDN, this plugin can automate the process:
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Support forum for Event Espresso 3 and Event Espresso 4.