Client needs to update Modernizr on site previously built. How do I find what I need to include in custom download package to update it?

A client's existing website no longer loads correctly due to incompatibilities with JavaScript through their reverse proxy and has an outdated version of Modernizr screaming errors in the console (mainly that it requires an update for compatibility).

Having no experience with Modernizr, I figured it would be a simple update, but I've discovered that it requires a custom build. I have no idea how to determine what the existing build consists of, so I don't know what features to include in the update.

How can I go about finding this?

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