I've repackaged this add-on into a 1.0.1 version, which you can download below. The main change is incorporating the required PHP fix. So, this will work properly with vBulletin 3.8.11 and PHP 5.6/7.0/7.1. It should also work with earlier versions, though the minimum PHP version required is probably something like PHP 5.3.
I also updated all the UI elements to refer to the feature as "reCAPTCHA v2" instead of "New reCAPTCHA". I also updated the readme docs, correcting errors and typos.
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