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1. No there isn't a Pro version - there is only one version
2. I'm not quite sure what you mean by addons, but we have a large code modification community at vBulletin.org if that's what you mean.
3. We do optionally use cookies - if the user supports cookies, then they are used, otherwise they are not. On a side note I doubt the EU legislation will ever go through - so you have nothing to worry about in that respect.
vBulletin works on PHP 3.09 or later (though 4.x is recommended). There is a PHP3 extensions download in the Members Area.
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