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'm trying to download version 6.4.0 but it won't let me. I click the 6.4.0 version and it just sends me back to the page. I can only download the latest version.