The version of jQuery and Fancybox built-in to Unbounce are both 5 years old. That’s an eternity in the digital world.
In 2010, when Fancybox updated to 2.0, they switched to a licensing model. Unfortunately, unless you pay for the license, you aren’t able use Fancybox 2 which maintains compatibility with the latest version of jQuery.
Lately, I’ve been needing to manually add newer versions of jQuery to maintain compatibility with other libraries. I’ve even switched away from Fancybox to a newer lightbox called Magnific Popup.
Here are some options to update these outdated libraries: