Is it alright to install this Plug-in?

Hi, I have read around in this forum that installing some mods (from .org) could result in a negative effect on SEO, if they are not well-coded. So just wondering whether it will be alright to install this Plug-in on a higher vBulletin version? http://www.vbulletin.org/forum/showthread.php?t=198913

Thanks.

AS long as you are still able to register, i don't see any issues with it. bots won't register on your site.