Just a quick note, you find all your questions and answers on my website for the XenForo Torrent Tracker.
Also note Torrent Tracker 2.2.18.1 does not work correctly and it is missing some files that was updated in Torrent in a later version that doesn't work either. To sum this up quickly, the only version working correctly is Torrent Tracker 2.2.18.0 I have seen a few nulled websites with out naming them saying there is a Torrent Tracker 2.2.20, which is supposed to be an update for XenForo 2.2.16, that is all hog wash., it doesn't work either. The latest and current version of 2.2.18.0 will work on XenForo 2.2.15 and XenForo 2.2.16 perfectly fine. Also note this is not a version of Torrent Tracker that works on XenForo 2.3.0 at all, nothing has been made for this version as of yet..