Converting from PHPBB3 to VBulletin
 

There is one question that I want to have answered before I purchase the license.

There are a couple of features that I want that do not come with VBulletin. They require a MOD. One of these is a Thank You button. If I purchased VBulletin and modified it, does that make me exempt from support? I'm worried that I'll install a MOD, something will happen to destroy the forum, and I'll have no recourse to fix it.