To downgrade, Im 99% sure you can use Impex.
DOPE Reviewed by DOPE on . Privacy Issue with vB 4.0.4 Privacy Issue with 4.0.4 and the Recent Threads Widget It has come to our attention that there is a bug in 4.0.4 that allows guests to see threads posted in private forums when using the Recent Threads Widget. Please see this bug report for the fix: http://tracker.vbulletin.com/browse/VBIV-7562 If you do not have time to patch that file, then we suggest that you disable the Recent Threads Rating: 5