What are lifetime updates?
Simply put, lifetime updates mean until I die or a XenForo version is declared End of Life. Whichever comes first.
This may extend to first point releases as XenForo deems necessary.
Where an add-on works with both XenForo 2.0 and XenForo 2.1, support for XenForo 2.0 may be removed without notice if XenForo 2.0 is declared End of Life.
At this time, these are the known End of Life dates for XenForo versions: