Dont use a nulled version of xenforo and pay for all addons is the easiest way but why else would we be on this site.. I have stuff leaked on here from my own account on mc market xD Anyways this is always complex and hard to solve start by making sure the version of the addon will work with the version of xenforo you have
I did not violate any rules and I am 100% sure of that. But my account, for which I bought VIP and MCModels the day before yesterday, was blocked for no reason