Does it work with Traktor Pro?
It's a firmware update for the VMS4. Nothing to do with the DJ software you choose to use!
Although having said that, it does seem that the cue button fault only happened when running VDJ - the VMS4 didn't do it when used standalone.
So, if you're not running VDJ (and never will) then there's probably no point in upgrading - if the cue button was the only fix.