And what is holding you back to look for the answer on the site of the developer what latest version is before asking here?
https://xenforo.com/community/forums/announcements/
Sometimes its so simple to find answers directly . . .
XenForo Releases
Xenforo Nulled 1.5.4
Submitted by Deleted_3747, 04-01-2016, 12:46 AM, Thread ID: 16356
Thread Closed
RE: Xenforo Nulled 1.5.4 12-01-2016, 12:17 AM #7
12-01-2016, 12:17 AM
#7