I kept my mouth shut on this because I haven't run vBulletin 3.x in over a decade but there are reasons for that, like half of the 3.x mods having security flaws that make them unusable on public servers. These mods were coded for PHP versions that have been deprecated for a decade. They were coded using deprecated transitional HTML and XML. They don't meet minimum security standards and most of the developers have long since moved on so they can't even be contacted for permission to modify their work. I'm actually surprised how many are still available for download.
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