It was Paul Marsden who developed a PHP7 compatible version of vBulletin 4 but he did not and is not authorized to make it public. I don't even know if he continues to use it. I think it would be fair to say he and vBulletin did not part on the most amicable of terms.
Insofar as the current development team there is a zero percent chance of them going backwards. vBulletin 4 is a technological dinosaur. It still works but for how much longer? SQL 8.0 and PHP 8 are about to become the industry standards.
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